Define Explicit Public API Surface for Avro modules #8103

Job	Run time
cibw-dev-env-smoke-test	30s
integration-test-s3	7m 32s
integration-test-adls	7m 8s
lint-and-unit-test (3.10)	3m 18s
lint-and-unit-test (3.11)	2m 42s
integration-test-gcs	6m 39s
lint-and-unit-test (3.12)	8m 48s
lint-and-unit-test (3.13)	2m 49s
integration-test	16m 34s
integration-coverage-report	28s
	56m 28s

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