[Task]: [Avro] Deprecate Avro API classes in "sdks/java/core"

[aromanenko-dev]

What needs to happen?

Once all Beam modules start to use sdks/java/extensions/avro we need to deprecate Avro API classes in sdks/java/core but keep them for a while for a sake of backward compatibility.

Affected classes:

• org.apache.beam.sdk.coders.AvroCoder
• org.apache.beam.sdk.coders.AvroGenericCoder
• org.apache.beam.sdk.io.AvroIO
• org.apache.beam.sdk.io.AvroSource
• org.apache.beam.sdk.io.DynamicAvroDestinations
• org.apache.beam.sdk.io.AvroSchemaIOProvider
• org.apache.beam.sdk.io.AvroSink
• org.apache.beam.sdk.io.SerializableAvroCodecFactory (package private)
• org.apache.beam.sdk.io.ConstantAvroDestination (package private)
• org.apache.beam.sdk.schemas.utils.AvroUtils
• org.apache.beam.sdk.schemas.utils.AvroByteBuddyUtils (package private)
• org.apache.beam.sdk.schemas.utils.ConvertHelpers
• org.apache.beam.sdk.schemas.AvroRecordSchema

Issue Priority

Priority: 2 (default / most normal work should be filed as P2)

Issue Components

• Component: Python SDK
• Component: Java SDK
• Component: Go SDK
• Component: Typescript SDK
• Component: IO connector
• Component: Beam examples
• Component: Beam playground
• Component: Beam katas
• Component: Website
• Component: Spark Runner
• Component: Flink Runner
• Component: Samza Runner
• Component: Twister2 Runner
• Component: Hazelcast Jet Runner
• Component: Google Cloud Dataflow Runner