feat: add xrp coin

Ticket: BG-0

Author: lcovar

modules/sdk-coin-xpr/.eslintignore

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+dist
+node_modules

modules/sdk-coin-xpr/.gitignore

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+/dist
+/node_modules
+/.nyc_output

modules/sdk-coin-xpr/.mocharc.yml

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+require:
+  - ts-node/register
+  - source-map-support/register
+spec: 'test/unit/**/*.ts'
+timeout: 10000
+reporter: min

modules/sdk-coin-xpr/.npmignore

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+**/*.ts
+!**/*.d.ts
+src
+test
+tsconfig.json
+tslint.json
+.gitignore
+.eslintignore
+.mocharc.yml
+.prettierignore

modules/sdk-coin-xpr/.prettierignore

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+dist
+node_modules

modules/sdk-coin-xpr/.prettierrc.yml

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+printWidth: 120
+singleQuote: true
+trailingComma: es5

modules/sdk-coin-xpr/README.md

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+# BitGo sdk-coin-xpr
+
+SDK coins provide a modular approach to a monolithic architecture. This and all BitGoJS SDK coins allow developers to use only the coins needed for a given project.
+
+## Installation
+
+All coins are loaded traditionally through the `bitgo` package. If you are using coins individually, you will be accessing the coin via the `@bitgo/sdk-api` package.
+
+In your project install both `@bitgo/sdk-api` and `@bitgo/sdk-coin-xpr`.
+
+```shell
+npm i @bitgo/sdk-api @bitgo/sdk-coin-xpr
+```
+
+Next, you will be able to initialize an instance of "bitgo" through `@bitgo/sdk-api` instead of `bitgo`.
+
+```javascript
+import { BitGoAPI } from '@bitgo/sdk-api';
+import { Xpr } from '@bitgo/sdk-coin-xpr';
+
+const sdk = new BitGoAPI();
+
+sdk.register('xpr', Xpr.createInstance);
+```
+
+## Development
+
+Most of the coin implementations are derived from `@bitgo/sdk-core`, `@bitgo/statics`, and coin specific packages. These implementations are used to interact with the BitGo API and BitGo platform services.
+
+You will notice that the basic version of common class extensions have been provided to you and must be resolved before the package build will succeed. Upon initiation of a given SDK coin, you will need to verify that your coin has been included in the root `tsconfig.packages.json` and that the linting, formatting, and testing succeeds when run both within the coin and from the root of BitGoJS.

modules/sdk-coin-xpr/package.json

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+{
+  "name": "@bitgo/sdk-coin-xpr",
+  "version": "1.0.0",
+  "description": "BitGo SDK coin library for Proton (XPR Network)",
+  "main": "./dist/src/index.js",
+  "types": "./dist/src/index.d.ts",
+  "scripts": {
+    "build": "yarn tsc --build --incremental --verbose .",
+    "fmt": "prettier --write .",
+    "check-fmt": "prettier --check '**/*.{ts,js,json}'",
+    "clean": "rm -r ./dist",
+    "lint": "eslint --quiet .",
+    "prepare": "npm run build",
+    "test": "npm run coverage",
+    "coverage": "nyc -- npm run unit-test",
+    "unit-test": "mocha"
+  },
+  "author": "BitGo SDK Team <sdkteam@bitgo.com>",
+  "license": "MIT",
+  "engines": {
+    "node": ">=20 <23"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/BitGo/BitGoJS.git",
+    "directory": "modules/sdk-coin-xpr"
+  },
+  "lint-staged": {
+    "*.{js,ts}": [
+      "yarn prettier --write",
+      "yarn eslint --fix"
+    ]
+  },
+  "publishConfig": {
+    "access": "public"
+  },
+  "nyc": {
+    "extension": [
+      ".ts"
+    ]
+  },
+  "dependencies": {
+    "@bitgo/sdk-core": "^36.29.0",
+    "@bitgo/secp256k1": "^1.9.0",
+    "@bitgo/statics": "^58.23.0",
+    "bignumber.js": "^9.1.1",
+    "eosjs": "^21.0.2",
+    "eosjs-ecc": "^4.0.4",
+    "lodash": "^4.17.14",
+    "superagent": "^9.0.1"
+  },
+  "devDependencies": {
+    "@bitgo/sdk-api": "^1.73.3",
+    "@bitgo/sdk-test": "^9.1.24",
+    "@types/lodash": "^4.14.121"
+  },
+  "files": [
+    "dist"
+  ]
+}

modules/sdk-coin-xpr/src/index.ts

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+export * from './lib';
+export * from './xpr';
+export * from './txpr';
+export * from './register';

modules/sdk-coin-xpr/src/lib/constants.ts

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+/**
+ * Constants for Proton (XPR Network)
+ */
+
+export const MAINNET_COIN = 'xpr';
+export const TESTNET_COIN = 'txpr';
+
+// Proton mainnet chain ID
+export const MAINNET_CHAIN_ID = '384da888112027f0321850a169f737c33e53b388aad48b5adace4bab97f437e0';
+// Proton testnet chain ID
+export const TESTNET_CHAIN_ID = '71ee83bcf52142d61019d95f9cc5427ba6a0d7ff8accd9e2088ae2abeaf3d3dd';
+
+// Proton address constraints (same as EOS: up to 12 characters, only a-z and 1-5)
+export const ADDRESS_LENGTH = 12;
+export const VALID_ADDRESS_CHARS = '12345abcdefghijklmnopqrstuvwxyz'.split('');
+// Proton addresses: up to 12 characters, only a-z, 1-5, and . (dot)
+export const VALID_ADDRESS_REGEX = /^[a-z1-5.]{1,12}$/;
+// EOS-style public key format: PUB_K1_xxx or EOS_xxx (legacy)
+export const VALID_PUBLIC_KEY_REGEX = /^(PUB_K1_[A-Za-z0-9]+|EOS[A-Za-z0-9]+)$/;
+
+// Transaction expiry - 8 hours in seconds (same as EOS)
+export const TX_EXPIRY_SECONDS = 28800;
+
+// Token contract for XPR native token transfers
+export const TOKEN_CONTRACT = 'eosio.token';
+export const TOKEN_SYMBOL = 'XPR';
+export const TOKEN_PRECISION = 4;
+
+// System contract
+export const SYSTEM_CONTRACT = 'eosio';