Bring back Codecov

[JavierMonton]

• Bringing back Codecov for Scala 2, skipped for Scala 3 for now.
• Splitted the CI by Scala version

[codecov]

Codecov Report

Merging #151 (91f0c09) into main (56c74b7) will decrease coverage by 20.87%.
The diff coverage is 76.35%.

@@             Coverage Diff              @@
##              main     #151       +/-   ##
============================================
- Coverage   100.00%   79.12%   -20.88%     
============================================
  Files           13       23       +10     
  Lines          173      321      +148     
  Branches         4        5        +1     
============================================
+ Hits           173      254       +81     
- Misses           0       67       +67     

Flag	Coverage Δ
bq-integration	?
unittests	79.12% <76.35%> (+2.24%)	⬆️

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

Impacted Files	Coverage Δ
...s/bigdatatypes/cassandra/parser/ParsingError.scala	0.00% <0.00%> (ø)
...s/bigdatatypes/conversions/SqlTypeConversion.scala	100.00% <ø> (ø)
...2/org/datatools/bigdatatypes/formats/Formats.scala	100.00% <ø> (ø)
...s/bigdatatypes/formats/KeyTypeExampleFormats.scala	100.00% <ø> (ø)
...atatools/bigdatatypes/formats/SnakifyFormats.scala	100.00% <ø> (ø)
...ls/bigdatatypes/bigquery/BigQueryDefinitions.scala	16.66% <6.25%> (-83.34%)	⬇️
...atatools/bigdatatypes/bigquery/BigQueryTable.scala	30.55% <31.25%> (-69.45%)	⬇️
...datatypes/cassandra/parser/CreateTableParser.scala	70.96% <70.96%> (ø)
...atools/bigdatatypes/spark/SqlInstanceToSpark.scala	75.00% <75.00%> (ø)
...tools/bigdatatypes/cassandra/CassandraTables.scala	90.90% <90.90%> (ø)
... and 19 more

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