feat(stdlib/sql): add BigQuery support

[alespour]

This PR add BigQuery support to sql package.

• It uses forked driver bonitoo-io/go-sql-bigquery because the original was incomplete/ready for integration and seems kind of unmaintaned or inactive at least
• The driver name is bigquery and uses URL format with bigquery scheme as connection string

Done checklist

• docs/SPEC.md updated
• Test cases written

[codecov-commenter]

Codecov Report

Merging #2925 into master will increase coverage by 0.31%.
The diff coverage is 51.92%.

@@            Coverage Diff             @@
##           master    #2925      +/-   ##
==========================================
+ Coverage   51.75%   52.06%   +0.31%     
==========================================
  Files         332      333       +1     
  Lines       41398    41502     +104     
==========================================
+ Hits        21426    21610     +184     
+ Misses      17511    17416      -95     
- Partials     2461     2476      +15     

Impacted Files	Coverage Δ
stdlib/sql/bigquery.go	45.65% <45.65%> (ø)
stdlib/sql/from.go	33.62% <100.00%> (+1.16%)	⬆️
stdlib/sql/source_validator.go	78.94% <100.00%> (+3.43%)	⬆️
stdlib/sql/to.go	45.56% <100.00%> (+0.44%)	⬆️
stdlib/universe/pivot.gen.go	10.14% <0.00%> (+0.21%)	⬆️
stdlib/sql/mysql.go	42.47% <0.00%> (+1.76%)	⬆️
stdlib/sql/postgres.go	48.48% <0.00%> (+2.02%)	⬆️
stdlib/sql/mssql.go	53.19% <0.00%> (+28.36%)	⬆️
stdlib/sql/snowflake.go	44.03% <0.00%> (+40.36%)	⬆️
... and 1 more

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[wolffcm]

Overall this is very fine work, as usual. I just had some questions below.

[wolffcm]

I'm curious why you needed to bump the version of this? Maybe as I review it will become clear.

[alespour]

It was not intentional, I do not know how to make mod tidy not update it... :(

[wolffcm]

Ah, I guess that maybe one of the new dependencies needed a newer version of it then.

[wolffcm]

I see that you forked solcates repository, but also merged some changes to there, does that mean we can use the original github.com/solcates/go-sql-bigquery now?

[alespour]

Since I wasn't getting a response from the maintainer who seem to have abandoned the project, I gave up on hoping on the merge and continued with modifications in the bonitoo-io fork. The owner then commented later that he _ had totally forgotten about this project_ and merged the PR, but the fork has diverted more from the original before that, into more pure SQL golang driver unlike the original which also contained some ORM stuff etc.

The original project does not seem to be active (no commits since Oct 27, 2019) and maintained (eg. PR was merge despite failing check due to some missing 3rd party lib).

[wolffcm]

Looks great. Thanks for this fine work.