Move job serialisation to driver

[adam-fowler]

See hummingbird-project/swift-jobs#63

[codecov]

Codecov Report

Attention: Patch coverage is 94.73684% with 2 lines in your changes missing coverage. Please review.

Project coverage is 89.59%. Comparing base (d59ff63) to head (e45bf31).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
Sources/JobsRedis/RedisJobQueue.swift	94.73%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #22      +/-   ##
==========================================
+ Coverage   88.67%   89.59%   +0.91%     
==========================================
  Files           3        3              
  Lines         212      221       +9     
==========================================
+ Hits          188      198      +10     
+ Misses         24       23       -1     

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[thoven87]

lgtm