Add Schema Registry Avro functions for column deserialization

[arerlend]

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[arerlend]

Permissive mode support is missing.

[tfayyaz]

Are there any updates on when this PR will be merged? I am coming across the same issue mentioned here where the stream does not initialise - arerlend/azure-schemaregistry-spark#3

[kevinlacire]

Any updates ? this feature is a MVP in a pub/sub world