Support Query{n} for BeamSQL

[regadas]

No description provided.

[codecov]

Codecov Report

Merging #1944 into master will decrease coverage by 5.01%.
The diff coverage is 15.34%.

@@            Coverage Diff             @@
##           master    #1944      +/-   ##
==========================================
- Coverage   72.58%   67.57%   -5.02%     
==========================================
  Files         202      214      +12     
  Lines        6326     6630     +304     
  Branches      430      452      +22     
==========================================
- Hits         4592     4480     -112     
- Misses       1734     2150     +416

Impacted Files	Coverage Δ
...e/src/main/scala/com/spotify/scio/sql/Query8.scala	0% <0%> (ø)
...e/src/main/scala/com/spotify/scio/sql/Query9.scala	0% <0%> (ø)
...e/src/main/scala/com/spotify/scio/sql/Query6.scala	0% <0%> (ø)
...e/src/main/scala/com/spotify/scio/sql/Query5.scala	0% <0%> (ø)
.../src/main/scala/com/spotify/scio/sql/Query10.scala	0% <0%> (ø)
...e/src/main/scala/com/spotify/scio/sql/Query4.scala	0% <0%> (ø)
...e/src/main/scala/com/spotify/scio/sql/Query7.scala	0% <0%> (ø)
...n/scala/com/spotify/scio/sql/SqlInterpolator.scala	76% <100%> (-2.13%)	⬇️
...om/spotify/scio/sql/syntax/SCollectionSyntax.scala	100% <100%> (ø)	⬆️
...core/src/main/scala/com/spotify/scio/sql/Sql.scala	85.24% <100%> (-3.06%)	⬇️
... and 32 more

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[jto]

LGTM