Improve ColumnDefinitionParser::extraInfo() method

[Tigrov]

It will be used in alterColumn() method

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

[codecov]

Codecov Report

Attention: Patch coverage is 70.00000% with 6 lines in your changes missing coverage. Please review.

Project coverage is 93.29%. Comparing base (3167625) to head (f1f7248).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/Syntax/ColumnDefinitionParser.php	70.00%	6 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #900      +/-   ##
============================================
- Coverage     99.60%   93.29%   -6.32%     
- Complexity     1539     1544       +5     
============================================
  Files            81       81              
  Lines          3800     3818      +18     
============================================
- Hits           3785     3562     -223     
- Misses           15      256     +241     

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