Avro Schema Definition flags are not exposed on Pulsar Functions

[psilos]

Describe the bug
A few stories have been added that allow Avro Schema Compatibility on Pulsar to conform with the default Avro behaviour, namely:

• Upgrade Avro to 1.9.1 #5938
• Add Joda time logical type conversion. #6704 -- adding boolean isJsr310ConversionEnabled
• revise the schema default type not null #3752 -- adding boolean getAlwaysAllowNull

Unfortunately these flags are not exposed into Pulsar Function configuration, therefore we cannot AUTO_CONSUME or AUTO_PRODUCE to topics with stricter Avro Schema Validation

Expected behavior

• The same flags to be exposed under Functions Configuration
• Upon setting those flags, a function should be able to consume from a Topic with strict(default) Avro Schema Validation
• Upon setting those flags, a function should be able to produce from a Topic with strict(default) Avro Schema Validation