Search improves

[Nagyjano]

Added features:

• min length for input to start search (default is set to 1)
• expand of nodes on search or not (default is set to true)
• if expand on search how many matched nodes should expand. (default is set to Infinity)

All changes with the default settings do not alter the component former behaviour

[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 97.41%. Comparing base (9ae16b6) to head (90b4bd1).

Files with missing lines	Patch %	Lines
src/mixins/treeselectMixin.js	66.66%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #386      +/-   ##
==========================================
- Coverage   97.68%   97.41%   -0.28%     
==========================================
  Files          27       27              
  Lines        1037     1044       +7     
  Branches      104      104              
==========================================
+ Hits         1013     1017       +4     
- Misses          9       12       +3     
  Partials       15       15              

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