Add IcebergResourceManager

[tarun-google]

Adding Basic version of IcebergResourceManager that can be utilized with tests. This should cover all the use cases. In the next PR with JDBCToIceberg i look to improve this if more cases are found.

[codecov]

Codecov Report

❌ Patch coverage is 89.79592% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 50.24%. Comparing base (59d8c15) to head (25233f2).
⚠️ Report is 11 commits behind head on main.

Files with missing lines	Patch %	Lines
...ud/teleport/it/iceberg/IcebergResourceManager.java	89.79%	7 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##               main    #2985    +/-   ##
==========================================
  Coverage     50.23%   50.24%            
- Complexity     5001     5015    +14     
==========================================
  Files           966      967     +1     
  Lines         59157    59261   +104     
  Branches       6445     6458    +13     
==========================================
+ Hits          29719    29775    +56     
- Misses        27334    27378    +44     
- Partials       2104     2108     +4     

Components	Coverage Δ
spanner-templates	70.41% <ø> (-0.04%)	⬇️
spanner-import-export	68.93% <ø> (-0.05%)	⬇️
spanner-live-forward-migration	79.69% <ø> (ø)
spanner-live-reverse-replication	77.03% <ø> (-0.05%)	⬇️
spanner-bulk-migration	88.33% <ø> (ø)

Files with missing lines	Coverage Δ
...ud/teleport/it/iceberg/IcebergResourceManager.java	89.79% <89.79%> (ø)

... and 6 files with indirect coverage changes

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