feat: add contains filter [FluxDSL]

[yoobi]

Closes #353

Proposed Changes

Briefly describe your proposed changes:

Adding contains filter

Checklist

• CHANGELOG.md updated
• Rebased/mergeable
• A test has been added if appropriate
• mvn test completes successfully
• Commit messages are conventional
• Sign CLA (if not already signed)

[bednar]

@yoobi Thanks for your PR 👍

[bednar]

LGTM 🚀

[codecov-commenter]

Codecov Report

Merging #354 (7fb13e7) into master (4ee481b) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #354      +/-   ##
============================================
+ Coverage     88.97%   88.99%   +0.01%     
  Complexity      634      634              
============================================
  Files           155      155              
  Lines          6333     6340       +7     
  Branches        302      302              
============================================
+ Hits           5635     5642       +7     
  Misses          612      612              
  Partials         86       86              

Impacted Files	Coverage Δ
...y/dsl/functions/restriction/ColumnRestriction.java	100.00% <100.00%> (ø)

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