Allow scalar values for `Query::select()`

[Tigrov]

Related PRs

• yiisoft/db-pgsql#340
• yiisoft/db-sqlite#292
• yiisoft/db-oracle#259
• yiisoft/db-mssql#296
• yiisoft/db-mysql#329

Q	A
Is bugfix?	❌
New feature?	✔️
Breaks BC?	✔️
Fixed issues	#763

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 99.56%. Comparing base (789523f) to head (34a8a2a).

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #816   +/-   ##
=========================================
  Coverage     99.56%   99.56%           
- Complexity     1316     1317    +1     
=========================================
  Files            64       64           
  Lines          3228     3237    +9     
=========================================
+ Hits           3214     3223    +9     
  Misses           14       14           

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