[WIP] Add UUID support in import/export templates

[lagarwal1]

feat: Add support for importing/exporting UUID columns as strings

Tests in cloud devel

Avro

GSQL

Export
Import

Postgres

Export
Import

CSV

GSQL

Export - Todo
Import - Todo

Postgres

Export - Todo
Import - Todo

[codecov]

Codecov Report

Attention: Patch coverage is 57.81250% with 27 lines in your changes missing coverage. Please review.

Project coverage is 46.83%. Comparing base (177a218) to head (4a03adc).
Report is 40 commits behind head on main.

Files with missing lines	Patch %	Lines
...e/beam/it/gcp/spanner/matchers/SpannerAsserts.java	0.00%	13 Missing ⚠️
...cloud/teleport/spanner/SpannerRecordConverter.java	33.33%	4 Missing and 2 partials ⚠️
...le/cloud/teleport/spanner/TextImportTransform.java	0.00%	2 Missing and 2 partials ⚠️
.../apache/beam/sdk/io/gcp/spanner/SpannerSchema.java	0.00%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2145      +/-   ##
============================================
+ Coverage     46.40%   46.83%   +0.43%     
- Complexity     3932     4324     +392     
============================================
  Files           859      874      +15     
  Lines         51300    52008     +708     
  Branches       5394     5458      +64     
============================================
+ Hits          23804    24359     +555     
- Misses        25783    25909     +126     
- Partials       1713     1740      +27     

Components	Coverage Δ
spanner-templates	68.79% <77.27%> (+0.53%)	⬆️
spanner-import-export	65.63% <77.27%> (+0.03%)	⬆️
spanner-live-forward-migration	76.50% <ø> (-0.17%)	⬇️
spanner-live-reverse-replication	78.66% <ø> (+0.72%)	⬆️
spanner-bulk-migration	87.87% <ø> (+0.57%)	⬆️

Files with missing lines	Coverage Δ
...le/cloud/teleport/spanner/AvroRecordConverter.java	99.69% <ø> (ø)
...oud/teleport/spanner/AvroSchemaToDdlConverter.java	84.88% <100.00%> (+1.32%)	⬆️
...teleport/spanner/BuildReadFromTableOperations.java	44.92% <100.00%> (+9.33%)	⬆️
...oud/teleport/spanner/DdlToAvroSchemaConverter.java	93.03% <ø> (ø)
...gle/cloud/teleport/spanner/TextImportPipeline.java	0.00% <ø> (ø)
...oogle/cloud/teleport/spanner/common/SizedType.java	91.97% <100.00%> (+0.26%)	⬆️
...com/google/cloud/teleport/spanner/common/Type.java	90.62% <100.00%> (+0.43%)	⬆️
.../com/google/cloud/teleport/spanner/ddl/Column.java	83.78% <100.00%> (+0.60%)	⬆️
...google/cloud/teleport/templates/TextToSpanner.java	23.43% <100.00%> (+0.40%)	⬆️
...le/cloud/teleport/spanner/TextImportTransform.java	43.47% <0.00%> (-0.59%)	⬇️
... and 3 more

... and 55 files with indirect coverage changes