Implement ArrayMergeBuilder, LongestBuilder and ShortestBuilder

[Tigrov]

Related PR

• Add functions as expressions db#1029

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

[codecov]

Codecov Report

❌ Patch coverage is 96.87500% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 97.76%. Comparing base (8f4fd32) to head (f6898b8).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/Builder/ArrayMergeBuilder.php	94.11%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #357      +/-   ##
============================================
- Coverage     97.80%   97.76%   -0.04%     
- Complexity      231      243      +12     
============================================
  Files            23       26       +3     
  Lines           774      806      +32     
============================================
+ Hits            757      788      +31     
- Misses           17       18       +1     

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