[tpoliaw]

Allow the BlueapiClient to be imported from blueapi.client instead of
the repetitive blueapi.client.client.

The BlueapiRestClient is included as it may also be treated like an entry point
for scripts using blueapi as a library. For now, all other types (such as
exceptions) still need to be imported from their full module path.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.01%. Comparing base (8838efb) to head (d4f1ac1).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1356   +/-   ##
=======================================
  Coverage   95.00%   95.01%           
=======================================
  Files          42       43    +1     
  Lines        2765     2768    +3     
=======================================
+ Hits         2627     2630    +3     
  Misses        138      138           

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