Add redsync Mutex options for LockRedis and use context in LockRedis

[GRbit]

Hi @mennanov !

Thank you very much for the great library, great Token Bucket and Leaky Bucket implementations!

I wan to suggest a little 100% backward compatible improvement to allow a better control on mutexes in Redis. By default redsync have a delayFunc which automatically unlocks mutex if it wasn't acquired in a few seconds. For my case of limiters usage I need to have more control on this.

Feel free to ask me about any changes or change the code yourself the way you like.

I wish all the best, especially continued success in developing open-source projects!

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (b9fb5f6) 83.00% compared to head (f9da9b2) 83.00%.

Files	Patch %	Lines
locks.go	83.33%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #31   +/-   ##
=======================================
  Coverage   83.00%   83.00%           
=======================================
  Files          10       10           
  Lines        1183     1183           
=======================================
  Hits          982      982           
  Misses        137      137           
  Partials       64       64           

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[mennanov]

Thanks for contributing!