add static_select

[UshakovVasilii]

Not work with zero min/max

[upgreydd]

@flyinprogrammer works, thanks. @KevinThePepper this should be merged.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 20.00000% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.10%. Comparing base (e01770c) to head (d72d8ce).

Files with missing lines	Patch %	Lines
slack_blockkit/block_element.py	20.00%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master       #9      +/-   ##
==========================================
- Coverage   86.30%   84.10%   -2.20%     
==========================================
  Files           8        8              
  Lines         292      302      +10     
==========================================
+ Hits          252      254       +2     
- Misses         40       48       +8     

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