Option to set Job priority

[gpetretto]

While the JobDoc always had a priority attribute that is taken into account to sort the order of execution of jobs, there was actually no direct way of setting it. This PR introduces options to choose the priority at submission and update it in the DB.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 33.33333% with 6 lines in your changes missing coverage. Please review.

Project coverage is 47.99%. Comparing base (6281728) to head (5615349).

Files with missing lines	Patch %	Lines
src/jobflow_remote/cli/job.py	50.00%	2 Missing ⚠️
src/jobflow_remote/config/jobconfig.py	0.00%	2 Missing ⚠️
src/jobflow_remote/jobs/jobcontroller.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #183      +/-   ##
===========================================
+ Coverage    47.92%   47.99%   +0.07%     
===========================================
  Files           43       43              
  Lines         5156     5165       +9     
  Branches      1118     1121       +3     
===========================================
+ Hits          2471     2479       +8     
- Misses        2425     2429       +4     
+ Partials       260      257       -3     

Files with missing lines	Coverage Δ
src/jobflow_remote/jobs/data.py	67.55% <100.00%> (+0.14%)	⬆️
src/jobflow_remote/jobs/submit.py	81.48% <ø> (ø)
src/jobflow_remote/cli/job.py	20.86% <50.00%> (+0.42%)	⬆️
src/jobflow_remote/config/jobconfig.py	20.00% <0.00%> (-1.74%)	⬇️
src/jobflow_remote/jobs/jobcontroller.py	35.59% <0.00%> (-0.08%)	⬇️

... and 1 file with indirect coverage changes

[davidwaroquiers]

Great thx! Just one or two comments and suggestions.
One thing I mention here (but does not need to be done in this PR) is that maybe we could/should document all the things that are in set_run_config in subsubtitles.