Add support for extended search commands

[shacharPash]

This PR adding support for the commands:
FT.SPELLCHECK
FT.PROFILE
FT.SUGADD
FT.SUGDEL
FT.SUGGET
FT.SUGLEN

[codecov-commenter]

Codecov Report

Patch coverage: 98.90% and project coverage change: +0.22 🎉

Comparison is base (16f7291) 93.59% compared to head (dd50d99) 93.82%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #151      +/-   ##
==========================================
+ Coverage   93.59%   93.82%   +0.22%     
==========================================
  Files          81       82       +1     
  Lines        4869     5082     +213     
  Branches      460      476      +16     
==========================================
+ Hits         4557     4768     +211     
  Misses        185      185              
- Partials      127      129       +2     

Impacted Files	Coverage Δ
src/NRedisStack/Search/SearchCommandBuilder.cs	91.41% <95.74%> (+1.58%)	⬆️
src/NRedisStack/Search/Query.cs	98.15% <96.55%> (ø)
src/NRedisStack/Pipeline.cs	100.00% <100.00%> (ø)
src/NRedisStack/ResponseParser.cs	96.17% <100.00%> (+0.64%)	⬆️
src/NRedisStack/Search/FTSpellCheckParams.cs	100.00% <100.00%> (ø)
src/NRedisStack/Search/SearchCommands.cs	100.00% <100.00%> (ø)
src/NRedisStack/Search/SearchCommandsAsync.cs	96.03% <100.00%> (+1.13%)	⬆️
src/NRedisStack/Transactions.cs	88.23% <100.00%> (ø)

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