Prevent Identifier breakout via quoteSql() sequences

[vjik]

Q	A
Is bugfix?	❌
New feature?	❌
Breaks BC?	❌
Tests pass?	✔️

Related PRs:

• Fix Identifier tests db-mssql#444
• Fix Identifier tests db-mysql#487
• Fix Identifier tests db-oracle#415
• Fix Identifier tests db-pgsql#508
• Fix Identifier tests db-sqlite#436

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.73%. Comparing base (6c56b69) to head (7d1c202).

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #1207   +/-   ##
=========================================
  Coverage     98.73%   98.73%           
- Complexity     1663     1664    +1     
=========================================
  Files           125      125           
  Lines          4342     4350    +8     
=========================================
+ Hits           4287     4295    +8     
  Misses           55       55           

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