Adding in spanner support for databases

[InfernoJJ]

Adding in support for Spanner.

[codecov-commenter]

Codecov Report

Patch coverage: 58.06% and project coverage change: +4.90 🎉

Comparison is base (b0e6f79) 70.74% compared to head (34bb0e5) 75.65%.

❗ Current head 34bb0e5 differs from pull request most recent head 27b2f3c. Consider uploading reports for the commit 27b2f3c to get more accurate results

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #279      +/-   ##
==========================================
+ Coverage   70.74%   75.65%   +4.90%     
==========================================
  Files          27       28       +1     
  Lines         899      920      +21     
==========================================
+ Hits          636      696      +60     
+ Misses        234      178      -56     
- Partials       29       46      +17     

Impacted Files	Coverage Δ
database/model_config.go	100.00% <ø> (ø)
database/migrator.go	47.05% <44.44%> (+47.05%)	⬆️
database/pkger.go	55.10% <66.66%> (+55.10%)	⬆️
database/spanner.go	75.00% <75.00%> (ø)
database/database.go	12.19% <100.00%> (+7.06%)	⬆️

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