feat: added support for Django specific statement

[gauravsnj]

No description provided.

[codecov]

Codecov Report

Merging #382 (d02d2f0) into postgresql-dialect (a84945e) will increase coverage by 0.05%.
The diff coverage is 100.00%.

❗ Current head d02d2f0 differs from pull request most recent head cb4b6c8. Consider uploading reports for the commit cb4b6c8 to get more accurate results

@@                   Coverage Diff                    @@
##             postgresql-dialect     #382      +/-   ##
========================================================
+ Coverage                 86.36%   86.41%   +0.05%     
- Complexity                 1844     1847       +3     
========================================================
  Files                       121      122       +1     
  Lines                      6056     6064       +8     
  Branches                    838      838              
========================================================
+ Hits                       5230     5240      +10     
+ Misses                      594      592       -2     
  Partials                    232      232              

Flag	Coverage Δ
all_tests	86.41% <100.00%> (+0.05%)	⬆️

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Impacted Files	Coverage Δ
...ud/spanner/pgadapter/utils/ClientAutoDetector.java	93.18% <ø> (ø)
...statements/local/DjangoGetTableNamesStatement.java	100.00% <100.00%> (ø)
...om/google/cloud/spanner/pgadapter/ProxyServer.java	80.95% <0.00%> (+1.19%)	⬆️

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[olavloite]

nit: Could we rename this to something like DjangoGetTableNamesStatement and add a comment that this statement is used by Django to check whether the migrations tables exists. If it does not, then Django will assume that migrations are disabled, which makes it safe to mock this statement with an empty result set.

[gauravsnj]

done