normalize firestoreIO

[aIbrahiim]

Adds Java SchemaTransform providers for Firestore read and write so Firestore can be used from Beam YAML

Read (firestore_read:v1) lists documents from a collection and outputs Beam Rows using a JSON schema. Write (firestore_write:v1) takes Rows and upserts them with batchWrite. FirestoreUtils handles document toRow conversion, with config classes for both sides.

Registers ReadFromFirestore and WriteToFirestore in standard_io.yaml, pointing at the GCP expansion service jar.

Unit tests: FirestoreSchemaTransformProviderTest and FirestoreUtilsTest.

I validated locally:

./gradlew :sdks:java:io:google-cloud-platform:test \
  --tests "org.apache.beam.sdk.io.gcp.firestore.FirestoreSchemaTransformProviderTest" \
  --tests "org.apache.beam.sdk.io.gcp.firestore.FirestoreUtilsTest" 

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[Abacn]

Same as other IOs, we should be able to add a basic integration test (e.g. in extended tests), one can use 'firestoredb' as default firestore database, like other tests did

beam/runners/google-cloud-dataflow-java/build.gradle

Line 156 in 3b476c4

def firestoreDb = project.findProperty('firestoreDb') ?: 'firestoredb'

[aIbrahiim]

Run Yaml_Xlang_Direct PostCommit databases

[aIbrahiim]

cc: @Abacn

[Abacn]

This is only used in tests. Consider put it into 'test' extra and make the import optional in integration_tests.py

[github-actions]

Assigning reviewers:

R: @shunping for label python.
R: @Abacn for label java.

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