[Task]: TypedSchemaTransformProvider should generate Schema field names with `lower_snake_case` convention

[ahmedabu98]

What needs to happen?

TypedSchemaTransformProvider takes advantage of DefaultSchema and AutoValueSchema to convert an AutoValue config object to a Row.
AutoValueSchema is a GetterBasedSchemaProvider which simply infers names from an object's getter methods. The end result is a Row with field names in lowerCamelCase convention.

Since SchemaTransforms are intended for external (ie. non-Java) languages, we want to generate field names that are in lower_snake_case convention. Preferably, this would be done directly in TypedSchemaTransformProvider.

P.S. TypedSchemaTransformProvider's configFromRow() method should also be updated to accept a row with snake_case field names.

Issue Priority

Priority: 3 (nice-to-have improvement)

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