[DE-672] GET /_admin/shutdown

[aMahanna]

• Introduces shutdown_progress to query the progress of soft shutdown
• Introduces the soft parameter to the shutdown method to support soft shutdowns

[codecov-commenter]

Codecov Report

Merging #280 (ea9f1fe) into main (744a6e9) will decrease coverage by 0.24%.
Report is 12 commits behind head on main.
The diff coverage is 92.45%.

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@@            Coverage Diff             @@
##             main     #280      +/-   ##
==========================================
- Coverage   99.01%   98.77%   -0.24%     
==========================================
  Files          26       26              
  Lines        3958     4014      +56     
==========================================
+ Hits         3919     3965      +46     
- Misses         39       49      +10     

Files Changed	Coverage Δ
arango/client.py	98.41% <ø> (ø)
arango/database.py	99.72% <ø> (-0.14%)	⬇️
arango/http.py	100.00% <ø> (ø)
arango/collection.py	97.59% <91.39%> (-0.92%)	⬇️
arango/exceptions.py	100.00% <100.00%> (ø)
arango/request.py	94.44% <100.00%> (ø)
arango/utils.py	100.00% <100.00%> (ø)