Add method chaining for columns

[Tigrov]

Preparing to combine Column and ColumnSchema in one class

Related PR

• yiisoft/db-pgsql#349

Q	A
Is bugfix?	❌
New feature?	✔️/❌
Breaks BC?	❌
Fixed issues	#854

[codecov[bot]]

Codecov Report

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

Project coverage is 99.72%. Comparing base (61c325e) to head (ff9c0f8).

:exclamation: Current head ff9c0f8 differs from pull request most recent head f3d9636

Please upload reports for the commit f3d9636 to get more accurate results.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #852 +/- ## ============================================ + Coverage 99.66% 99.72% +0.06% Complexity 1348 1348 ============================================ Files 71 71 Lines 3306 3322 +16 ============================================ + Hits 3295 3313 +18 + Misses 11 9 -2 ```

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