Add source ddl classes

[Deep1998]

Create classes similar to spanner ddl but for source databases which allows storing the schema for migrations. This would be useful to remove dependency on session file for identifying source types.

[codecov]

Codecov Report

Attention: Patch coverage is 89.54248% with 16 lines in your changes missing coverage. Please review.

Project coverage is 54.71%. Comparing base (ece5482) to head (28752ba).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...anner/sourceddl/MySqlInformationSchemaScanner.java	86.48%	2 Missing and 3 partials ⚠️
...oud/teleport/v2/spanner/sourceddl/SourceTable.java	54.54%	5 Missing ⚠️
...r/sourceddl/CassandraInformationSchemaScanner.java	92.15%	2 Missing and 2 partials ⚠️
...m/google/cloud/teleport/v2/spanner/ddl/Column.java	0.00%	1 Missing ⚠️
...ud/teleport/v2/spanner/sourceddl/SourceSchema.java	75.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2525      +/-   ##
============================================
+ Coverage     49.59%   54.71%   +5.12%     
+ Complexity     4809     1855    -2954     
============================================
  Files           942      452     -490     
  Lines         57751    25142   -32609     
  Branches       6241     2594    -3647     
============================================
- Hits          28640    13757   -14883     
+ Misses        27063    10560   -16503     
+ Partials       2048      825    -1223     

Components	Coverage Δ
spanner-templates	70.98% <89.54%> (+1.11%)	⬆️
spanner-import-export	∅ <ø> (∅)
spanner-live-forward-migration	79.12% <89.54%> (+0.33%)	⬆️
spanner-live-reverse-replication	77.60% <89.54%> (+0.32%)	⬆️
spanner-bulk-migration	87.92% <89.54%> (+0.03%)	⬆️

Files with missing lines	Coverage Δ
.../teleport/v2/spanner/migrations/schema/Schema.java	90.47% <100.00%> (+0.31%)	⬆️
...rceddl/AbstractSourceInformationSchemaScanner.java	100.00% <100.00%> (ø)
...ud/teleport/v2/spanner/sourceddl/SourceColumn.java	100.00% <100.00%> (ø)
...eport/v2/spanner/sourceddl/SourceDatabaseType.java	100.00% <100.00%> (ø)
...m/google/cloud/teleport/v2/spanner/ddl/Column.java	57.98% <0.00%> (-0.35%)	⬇️
...ud/teleport/v2/spanner/sourceddl/SourceSchema.java	75.00% <75.00%> (ø)
...r/sourceddl/CassandraInformationSchemaScanner.java	92.15% <92.15%> (ø)
...anner/sourceddl/MySqlInformationSchemaScanner.java	86.48% <86.48%> (ø)
...oud/teleport/v2/spanner/sourceddl/SourceTable.java	54.54% <54.54%> (ø)

... and 515 files with indirect coverage changes

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[bharadwaj-aditya]

Some of these abstract classes seem like shell implementations. They can be interfaces as well to simplify the structure.

Please add some test cases with edge cases , null handling, missing fields etc.

[Deep1998]

Some of these abstract classes seem like shell implementations. They can be interfaces as well to simplify the structure.

Please add some test cases with edge cases , null handling, missing fields etc.

Thanks, added more test cases and removed the AbstractSourceInformationSchemaScanner for simplicity. The data model classes (SourceSchema, SourceTable, SourceColumn) are abstract classes because they use AutoValue, which allows us to avoid a lot of boiler plate code, so those I have kept as is.

[bharadwaj-aditya]

LGTM