add sql.raw

[yannvgn]

feature: pass raw data/values to queries:

const tableName = 'books'
const query = sql`select * from ${sql.raw(tableName)}`

• tests
• docs

[codecov]

Codecov Report

Merging #12 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #12   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           3      3           
  Lines          42     44    +2     
  Branches        2      2           
=====================================
+ Hits           42     44    +2

Impacted Files	Coverage Δ
lib/utils.ts	100% <ø> (ø)	⬆️
lib/pg.ts	100% <100%> (ø)	⬆️
lib/sql.ts	100% <100%> (ø)	⬆️

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