feat(datacatalog): generate lineage configmanagement library

[scotthart]

PiperOrigin-RevId: 886640538

[gemini-code-assist]

Code Review

This pull request introduces the Data Lineage Config Management API as a GA library, including the generated C++ client, connection classes, decorators, and documentation. The review identified a potential issue with the ExponentialBackoffPolicy configuration in the default options, where a zero initial delay and incorrect argument count were used. Additionally, a performance improvement was suggested to move a local request object instead of copying it when listing operations, and a concern was raised regarding the removal of LRO polling examples from the documentation.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.68%. Comparing base (d55d152) to head (8adc526).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #16069   +/-   ##
=======================================
  Coverage   92.68%   92.68%           
=======================================
  Files        2343     2343           
  Lines      216959   216959           
=======================================
+ Hits       201080   201098   +18     
+ Misses      15879    15861   -18     

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