KIP-193 — Add SchemaBuilder.from(Schema)

Discussion Connect

KIP-193 adds `SchemaBuilder.from(Schema)` to the Kafka Connect API, returning a new `SchemaBuilder` pre-populated with all fields from an existing schema. Writing SMTs that enrich a record's schema requires copying every field from the original schema manually; the helper method eliminates the boilerplate for the common case of adding or removing a small number of fields.

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