feature: add additional schema strategies and make configurable

[pnadolny13]

Right now the tap always uses the "infer" strategy based on sample records to build a json schema with genson. From tap-mongodb theres 3 common strategies that we'd probably want to support:

The strategy to use for schema resolution. Defaults to 'raw'. The 'raw' strategy uses a relaxed schema using additionalProperties: true to accept the document as-is leaving the target to respect it. Useful for blob or jsonl. The 'envelope' strategy will envelope the document under a key named document. The target should use a variant type for this key. The 'infer' strategy will infer the schema from the data based on a configurable number of documents.

• infer
• raw
• envelope