add bulk insert feature

[msillence]

new feature to easily allow bulk insert

[codecov-io]

Codecov Report

Merging #93 into master will increase coverage by 0.25%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #93      +/-   ##
==========================================
+ Coverage    81.8%   82.05%   +0.25%     
==========================================
  Files          43       43              
  Lines        1143     1148       +5     
  Branches       92       99       +7     
==========================================
+ Hits          935      942       +7     
+ Misses        208      206       -2

Impacted Files	Coverage Δ
...src/main/scala/sqlest/ast/syntax/QuerySyntax.scala	100% <ø> (ø)	:arrow_up:
sqlest/src/main/scala/sqlest/ast/Insert.scala	71.42% <100%> (+21.42%)	:arrow_up:
...rc/main/scala/sqlest/ast/syntax/InsertSyntax.scala	58.82% <100%> (+8.82%)	:arrow_up:

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[DavidGregory084]

Looks great, thanks @msillence !