Add JobOptions Injection

[gordonwatts]

Fixes #35

• Enable metadata that will inject configuration code into the analysis job's options
• Metadata blocks can depend on each other to enforce order of config
• Repeated metadata blocks are ignored
• Tested by running jet corrections
• Improve how the CI works (so we aren't running flake8 repeatedly)

[codecov[bot]]

Codecov Report

Merging #180 (4fd0f74) into master (2398a77) will increase coverage by 0.18%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #180      +/-   ##
==========================================
+ Coverage   94.37%   94.56%   +0.18%     
==========================================
  Files          25       25              
  Lines        1370     1416      +46     
  Branches      165      181      +16     
==========================================
+ Hits         1293     1339      +46     
  Misses         48       48              
  Partials       29       29              

Flag	Coverage Δ
unittests	94.56% <100.00%> (+0.18%)	:arrow_up:

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Impacted Files	Coverage Δ
func_adl_xAOD/atlas/xaod/executor.py	100.00% <100.00%> (ø)
func_adl_xAOD/common/executor.py	100.00% <100.00%> (ø)
func_adl_xAOD/common/math_utils.py	100.00% <100.00%> (ø)
func_adl_xAOD/common/meta_data.py	100.00% <100.00%> (ø)

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