feat(client): add zRevRankWithScore command

[raashish1601]

Summary

Adds ZREVRANK_WITHSCORE / zRevRankWithScore for Redis 7.2's ZREVRANK key member WITHSCORE form.

This mirrors the existing ZRANK_WITHSCORE implementation and keeps zRevRank itself unchanged, so existing callers keep the current number | null return type while callers that need the score can opt into the new command.

Closes #2464.

Redis command reference: https://redis.io/docs/latest/commands/zrevrank/

Validation

• node -r ts-node/register/transpile-only direct parse/transform check for ZREVRANK_WITHSCORE
• npm run lint:changed
• npm run check:command-jsdoc
• npm run build
• git diff --cached --check

I also attempted a grep-limited Mocha run for ZREVRANK_WITHSCORE.spec.ts, but this repo starts its Docker-backed Redis test environment in the global hooks before the grep-selected test runs. It failed locally at spawn docker ENOENT because Docker is not installed in this environment.

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Note

Low Risk
Low risk: additive command wiring and tests only, leaving existing ZREVRANK behavior and return type unchanged.

Overview
Adds a new ZREVRANK_WITHSCORE command (and zRevRankWithScore alias) that appends WITHSCORE to ZREVRANK and reuses ZRANK_WITHSCORE reply transformation to return { rank, score } or null.

Registers the command in the client command index with JSDoc, and adds a version-gated spec covering argument transformation plus null and populated sorted-set responses.

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