feat(renderer): enhance condition with custom function and comparators

[rvsia]

closes #899

• is can be a custom function receiving value and config as arguments and should return boolean
• adds 4 basic math comparators (>, >=, <, <=)

[codecov]

Codecov Report

Merging #900 (e8ce65b) into master (86f6580) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #900      +/-   ##
==========================================
+ Coverage   93.36%   93.39%   +0.02%     
==========================================
  Files         235      235              
  Lines        3678     3692      +14     
  Branches     1211     1220       +9     
==========================================
+ Hits         3434     3448      +14     
  Misses        244      244              

Impacted Files	Coverage Δ
...orm-renderer/src/files/default-schema-validator.js	99.15% <100.00%> (+0.02%)	⬆️
...s/react-form-renderer/src/files/parse-condition.js	98.21% <100.00%> (+0.38%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 5c7e7ca...e8ce65b. Read the comment docs.

[Hyperkid123]

🎉 This PR is included in version 2.18.0 🎉

The release is available on

• react-form-renderer (@latest dist-tag)

• pf3-component-mapper (@latest dist-tag)

• pf4-component-mapper (@latest dist-tag)

• mui-component-mapper (@latest dist-tag)

Demo can be found here!