Possibility to provide version and version epoch fields for publication

[FZambia]

Adding an option WithVersion for Publish op to keep in-app version inside Centrifuge history streams to drop non-actual messages (due to unordered processing) on Broker level.

This is mostly useful for channels where publications contain entire state, so loosing intermediary messages is safe and beneficial.

[codecov]

Codecov Report

Attention: Patch coverage is 73.80952% with 11 lines in your changes missing coverage. Please review.

Project coverage is 83.36%. Comparing base (d423464) to head (6d6e12f).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
options.go	0.00%	5 Missing ⚠️
internal/memstream/stream.go	55.55%	4 Missing ⚠️
broker_memory.go	94.73%	1 Missing ⚠️
broker_redis.go	88.88%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #472      +/-   ##
==========================================
- Coverage   83.39%   83.36%   -0.03%     
==========================================
  Files          39       39              
  Lines        8978     9012      +34     
==========================================
+ Hits         7487     7513      +26     
- Misses       1126     1135       +9     
+ Partials      365      364       -1     

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