Decode job straight from row

[adam-fowler]

Instead of decoding as a ByteBuffer and then decoding that ByteBuffer

[codecov]

Codecov Report

Attention: Patch coverage is 78.94737% with 12 lines in your changes missing coverage. Please review.

Project coverage is 89.31%. Comparing base (6d74f49) to head (501da4f).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...ources/JobsPostgres/AnyDecodableJob+postgres.swift	50.00%	7 Missing ⚠️
Sources/JobsPostgres/PostgresJobsQueue.swift	85.29%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #18      +/-   ##
==========================================
- Coverage   90.10%   89.31%   -0.80%     
==========================================
  Files           6        8       +2     
  Lines         384      421      +37     
==========================================
+ Hits          346      376      +30     
- Misses         38       45       +7     

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[thoven87]

Looks great already, next I will explore returning the job payload in the same call to dequeue a job to prevent another trip to the database.