Custom batch actions

[jowilf]

• Custom batch actions
• Add example
• Add tests
• Add docs

close #21

[codecov]

Codecov Report

Base: 100.00% // Head: 100.00% // No change to project coverage 👍

Coverage data is based on head (6f2458e) compared to base (bd45eab).
Patch coverage: 100.00% of modified lines in pull request are covered.

❗ Current head 6f2458e differs from pull request most recent head f461e53. Consider uploading reports for the commit f461e53 to get more accurate results

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #44   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           46        48    +2     
  Lines         3076      3163   +87     
=========================================
+ Hits          3076      3163   +87     

Impacted Files	Coverage Δ
starlette_admin/actions.py	100.00% <100.00%> (ø)
starlette_admin/base.py	100.00% <100.00%> (ø)
tests/dummy_model_view.py	100.00% <100.00%> (ø)
tests/mongoengine/test_view.py	100.00% <100.00%> (ø)
tests/odmantic/test_async_engine.py	100.00% <100.00%> (ø)
tests/odmantic/test_sync_engine.py	100.00% <100.00%> (ø)
tests/sqla/test_async_engine.py	100.00% <100.00%> (ø)
tests/sqla/test_sqlmodel.py	100.00% <100.00%> (ø)
tests/sqla/test_sync_engine.py	100.00% <100.00%> (ø)
tests/test_auth.py	100.00% <100.00%> (ø)
... and 2 more

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