Add refreshMaterializedView command

[Gerych1984]

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

Add new command to refresh PgSql materialized views. I think it can be added in CommandInterface

[codecov[bot]]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (02a2a87) 100.00% compared to head (f07182c) 99.85%. Report is 2 commits behind head on master.

Files	Patch %	Lines
src/Command.php	95.00%	1 Missing :warning:

Additional details and impacted files

@@              Coverage Diff              @@
##              master     #332      +/-   ##
=============================================
- Coverage     100.00%   99.85%   -0.15%     
- Complexity       241      252      +11     
=============================================
  Files             16       16              
  Lines            694      714      +20     
=============================================
+ Hits             694      713      +19     
- Misses             0        1       +1     

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[Gerych1984]

God idea.

• This method should be added in base yii-db package and should be consistent with other DBMS.
• The part of generating SQL query shold be in DDLQueryBuilder

I create this PR and i think they must be merged first