feat(spanner): add support for identity columns in import/export

[hengfengli]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 74.46809% with 12 lines in your changes missing coverage. Please review.

Project coverage is 45.98%. Comparing base (d96bd95) to head (a03ec33).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...oud/teleport/spanner/AvroSchemaToDdlConverter.java	77.77%	0 Missing and 4 partials ⚠️
.../com/google/cloud/teleport/spanner/ddl/Column.java	71.42%	0 Missing and 4 partials ⚠️
...om/google/cloud/teleport/spanner/ddl/Sequence.java	20.00%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1812      +/-   ##
============================================
+ Coverage     45.95%   45.98%   +0.02%     
- Complexity     3799     3810      +11     
============================================
  Files           851      851              
  Lines         50805    50844      +39     
  Branches       5343     5359      +16     
============================================
+ Hits          23349    23381      +32     
+ Misses        25762    25760       -2     
- Partials       1694     1703       +9     

Components	Coverage Δ
spanner-templates	67.60% <74.46%> (+0.01%)	⬆️
spanner-import-export	65.56% <74.46%> (+0.06%)	⬆️
spanner-live-forward-migration	76.30% <ø> (ø)
spanner-live-reverse-replication	77.25% <ø> (ø)
spanner-bulk-migration	86.87% <ø> (ø)

Files with missing lines	Coverage Δ
...va/com/google/cloud/teleport/spanner/AvroUtil.java	93.75% <ø> (ø)
...oud/teleport/spanner/DdlToAvroSchemaConverter.java	93.03% <100.00%> (+0.19%)	⬆️
.../teleport/spanner/ddl/DatabaseOptionAllowlist.java	100.00% <100.00%> (ø)
...oud/teleport/spanner/AvroSchemaToDdlConverter.java	83.56% <77.77%> (-0.33%)	⬇️
.../com/google/cloud/teleport/spanner/ddl/Column.java	83.17% <71.42%> (-1.77%)	⬇️
...om/google/cloud/teleport/spanner/ddl/Sequence.java	66.66% <20.00%> (-1.91%)	⬇️

... and 2 files with indirect coverage changes