Support UnifiedJedis transactions without calling multi first

[veselov]

Support UnifiedJedis create Transaction's that are not immediately entered into multi stage.
Resolves !3662

[codecov-commenter]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (77d52ab) 75.43% compared to head (6988cbc) 75.37%.
Report is 2 commits behind head on master.

❗ Current head 6988cbc differs from pull request most recent head 93f6f44. Consider uploading reports for the commit 93f6f44 to get more accurate results

Files	Patch %	Lines
...rc/main/java/redis/clients/jedis/UnifiedJedis.java	60.00%	2 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff              @@
##             master    #3663      +/-   ##
============================================
- Coverage     75.43%   75.37%   -0.07%     
+ Complexity     4897     4896       -1     
============================================
  Files           297      297              
  Lines         14965    14967       +2     
  Branches       1129     1129              
============================================
- Hits          11289    11281       -8     
- Misses         3182     3191       +9     
- Partials        494      495       +1     

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