Added support for MAXTEXTFIELDS on FT.CREATE.

[filipecosta90]

• Fixes MAXTEXTFIELDS support seemingly removed #76 ( cc @joshuaray )
• Added SetMaxTextFieldsFlag

[codecov]

Codecov Report

Merging #83 into master will increase coverage by 0.08%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #83      +/-   ##
==========================================
+ Coverage   77.29%   77.37%   +0.08%     
==========================================
  Files          13       13              
  Lines        1277     1282       +5     
==========================================
+ Hits          987      992       +5     
  Misses        231      231              
  Partials       59       59              

Impacted Files	Coverage Δ
redisearch/schema.go	87.16% <100.00%> (+0.44%)	⬆️

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