[MINOR] Add missing Apache License in source files

[yihua]

Change Logs

When running ./release/validate_staged_release.sh --release=0.13.0 --rc_num=1, the validation finds out that there were some source files that did not have Apache License:

./packaging/hudi-metaserver-server-bundle/pom.xml
./hudi-platform-service/hudi-metaserver/hudi-metaserver-server/src/main/resources/mybatis-config.xml
./hudi-utilities/src/test/resources/schema-provider/proto/parent_schema_recursive_depth_2.avsc
./hudi-utilities/src/test/resources/schema-provider/proto/sample_schema_defaults.avsc
./hudi-utilities/src/test/resources/schema-provider/proto/sample_schema_wrapped_and_timestamp_as_record.avsc
./hudi-utilities/src/test/resources/schema-provider/proto/oneof_schema.avsc
./hudi-utilities/src/test/resources/schema-provider/proto/parent_schema_recursive_default_limit.avsc

This PR adds the missing Apache License in the above source files.

Impact

Fixes the license validation. No impact on source files.

Risk level (write none, low medium or high below)

none

Documentation Update

N/A

Contributor's checklist

• Read through contributor's guide
• Change Logs and Impact were stated clearly
• Adequate tests were added if applicable
• CI passed