[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)