Fix/enrichment docs #33012

[Vishesh-Tripathi]

Description
fixes #<33012>

This pull request updates the enrichment documentation and related notebooks with the following improvements:

Documentation:

Added mention of BigQuery in the enrichment section.
Described the batching process and caching mechanism (with_redis_cache).
Notebooks:

Elaborated on the concept of cross-joins in both the bigtable_enrichment_transform.ipynb and vertex_ai_feature_store_enrichment.ipynb notebooks, with a more detailed explanation and added visual examples.
I could not fix the broken link because I think that resource may have been deleted.

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[Vishesh-Tripathi]

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[damccorm]

Thanks for looking into this one

[damccorm]

Could you link to https://beam.apache.org/releases/pydoc/current/apache_beam.transforms.enrichment.html#apache_beam.transforms.enrichment.Enrichment.with_redis_cache here?

[damccorm]

I don't think this generated code is right, with_redis_cache should be appended to the enrichment transform like this -

beam/sdks/python/apache_beam/transforms/enrichment_handlers/bigquery_it_test.py

Line 333 in b5fa883

| Enrichment(handler).with_redis_cache(self.host, self.port))

[damccorm]

Could you combine this cell and the next one into a single cell? I think they're discussing the same thing.

[Vishesh-Tripathi]

@damccorm Sir , I made changes, as you specified, please review it and let me know if there is any mistake , Thanks for help

[damccorm]

Thanks! I'll make a couple tweaks then merge