chore(scheduler): export SchedulerConfig struct

[reugn]

Can be useful for custom Scheduler implementations, as requested in #156.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 88.23529% with 2 lines in your changes missing coverage. Please review.

Project coverage is 94.97%. Comparing base (79df5a3) to head (ed0243d).

Files with missing lines	Patch %	Lines
quartz/scheduler.go	88.23%	2 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #157      +/-   ##
==========================================
+ Coverage   94.56%   94.97%   +0.40%     
==========================================
  Files          20       20              
  Lines        1233     1233              
==========================================
+ Hits         1166     1171       +5     
+ Misses         49       45       -4     
+ Partials       18       17       -1     

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