BigQuerySchemas API

[JavierMonton]

This PR aims to create a new public API for BigQuery that should allow to create Schemas without creating tables in a real environment.
This is similar to A.asBigQuery.schema but more explicitly: BigQuerySchemas.schema[A] and without an instance of a Product type.

[codecov]

Codecov Report

Merging #249 (363e21e) into main (4a6ef83) will decrease coverage by 6.56%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##              main     #249      +/-   ##
===========================================
- Coverage   100.00%   93.43%   -6.57%     
===========================================
  Files           24       25       +1     
  Lines          333      381      +48     
  Branches        45       50       +5     
===========================================
+ Hits           333      356      +23     
- Misses           0       25      +25     

Flag	Coverage Δ
unittests	92.33% <100.00%> (+5.84%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...ls/bigdatatypes/bigquery/BigQueryDefinitions.scala	97.29% <ø> (-2.71%)	⬇️
...atatools/bigdatatypes/bigquery/BigQueryTable.scala	63.07% <ø> (-36.93%)	⬇️
...atools/bigdatatypes/bigquery/BigQuerySchemas.scala	100.00% <100.00%> (ø)
...tatools/bigdatatypes/bigquery/JavaConverters.scala	100.00% <100.00%> (ø)
...tatools/bigdatatypes/bigquery/JavaConverters.scala	100.00% <100.00%> (ø)

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