Support for MS SQL Server

[k1LoW]

link #117

[codecov]

Codecov Report

Merging #118 into master will increase coverage by 1.76%.
The diff coverage is 83.66%.

@@            Coverage Diff             @@
##           master     #118      +/-   ##
==========================================
+ Coverage   70.84%   72.61%   +1.76%     
==========================================
  Files          12       12              
  Lines        2168     2509     +341     
==========================================
+ Hits         1536     1822     +286     
- Misses        486      521      +35     
- Partials      146      166      +20

Impacted Files	Coverage Δ
datasource/datasource.go	55.08% <100%> (+1.17%)	⬆️
drivers/mssql/mssql.go	83.54% <83.54%> (ø)
drivers/bq/bq.go

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