Add PubSubToBigTable blueprint/template

[derrickaw]

1. Adds a new PubSubToBigTable blueprint and template
2. Adds a helper support in pubsub
3. Needs a windowing improvement before merging - pending PR - [yaml] - add multi-line windowing json support apache/beam#37174
4. We previously expected the pending PR above to be needed for this PR, but the PR is only for multi-line support as single line string json is already supported. Hence why the tests passed on the PR.

[gemini-code-assist]

Summary of Changes

Hello @derrickaw, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request delivers a new streaming Dataflow template, PubSub_To_BigTable_Yaml, designed to process messages from a Pub/Sub topic, apply custom field mappings, and write the transformed data to a BigTable instance. It also includes robust error handling, directing any failed transformations to a designated dead-letter Pub/Sub topic. The changes encompass the template's definition, associated documentation, and an integration test to validate its functionality.

Highlights

• New Dataflow Template: Introduces a new PubSubToBigTable blueprint and template, enabling streaming data ingestion from Pub/Sub to BigTable with user-defined mappings.
• Pub/Sub Helper Support: Adds a new builder method to PubsubMessagesCheck in the Pub/Sub resource manager, simplifying the creation of subscriptions for testing purposes.
• Pending Windowing Improvement: Notes that a windowing improvement is needed for the template before merging, indicating a dependency on another pull request.

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 50.77%. Comparing base (a16c225) to head (0c8c437).
⚠️ Report is 13 commits behind head on main.

Files with missing lines	Patch %	Lines
.../it/gcp/pubsub/conditions/PubsubMessagesCheck.java	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##               main    #3150    +/-   ##
==========================================
  Coverage     50.76%   50.77%            
- Complexity     5101     5484   +383     
==========================================
  Files           974      975     +1     
  Lines         59967    59986    +19     
  Branches       6551     6552     +1     
==========================================
+ Hits          30445    30458    +13     
- Misses        27378    27387     +9     
+ Partials       2144     2141     -3     

Components	Coverage Δ
spanner-templates	70.93% <63.15%> (-0.01%)	⬇️
spanner-import-export	68.86% <ø> (+0.03%)	⬆️
spanner-live-forward-migration	80.03% <100.00%> (-0.03%)	⬇️
spanner-live-reverse-replication	77.64% <41.66%> (-0.10%)	⬇️
spanner-bulk-migration	88.48% <100.00%> (+<0.01%)	⬆️

Files with missing lines	Coverage Δ
.../it/gcp/pubsub/conditions/PubsubMessagesCheck.java	0.00% <0.00%> (ø)

... and 4 files with indirect coverage changes

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