Remove I/O in the event loop when creating client

[ctalkington]

inspired by ctalkington/python-ipp#481

[codecov]

Codecov Report

Merging #596 (d0395d6) into main (ac9c599) will increase coverage by 0.02%.
Report is 13 commits behind head on main.
The diff coverage is 97.29%.

@@            Coverage Diff             @@
##             main     #596      +/-   ##
==========================================
+ Coverage   96.06%   96.09%   +0.02%     
==========================================
  Files           7        7              
  Lines         432      435       +3     
  Branches       85       86       +1     
==========================================
+ Hits          415      418       +3     
  Misses          4        4              
  Partials       13       13              

Files Changed	Coverage Δ
src/rokuecp/resolver.py	89.47% <0.00%> (ø)
src/rokuecp/__init__.py	100.00% <100.00%> (ø)
src/rokuecp/helpers.py	89.28% <100.00%> (+0.19%)	⬆️
src/rokuecp/models.py	95.97% <100.00%> (ø)
src/rokuecp/rokuecp.py	98.52% <100.00%> (+<0.01%)	⬆️

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more