Support Weaviate Auto Schema

[samos123]

Currently the class has to be precreated in Weaviate for the Spark Connector to work. However, it might be possible to rely on auto schema creation instead, but this would require some changes to how inferSchema works in the Spark Connector: https://weaviate.io/developers/weaviate/current/schema/schema-configuration.html#auto-schema

[tickx-cegeka]

This would be a great addition still in 2024, could someone look at this again?

[hsm207]

auto schema is might not be a good idea. what if the doc to be ingested has an unexpected field?

maybe make it make it toggle-able? like, use it only for dev, and when go to prod, turn it off?