feat: Enable client to be configured with just server url

[abbiemery]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 77.88462% with 23 lines in your changes missing coverage. Please review.
✅ Project coverage is 94.29%. Comparing base (09a1b1b) to head (4f0b4a4).

Files with missing lines	Patch %	Lines
src/blueapi/cli/cli.py	81.11%	17 Missing ⚠️
src/blueapi/service/main.py	55.55%	4 Missing ⚠️
src/blueapi/client/rest.py	66.66%	1 Missing ⚠️
src/blueapi/service/interface.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1327      +/-   ##
==========================================
- Coverage   95.03%   94.29%   -0.75%     
==========================================
  Files          43       43              
  Lines        2780     2821      +41     
==========================================
+ Hits         2642     2660      +18     
- Misses        138      161      +23     

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