Support authenticated ogmios

[sassythesasquatchh]

Adds support for authenticated Ogmios connections by allowing additional headers to be passed during backend instantiation.

[codecov]

Codecov Report

❌ Patch coverage is 63.63636% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.98%. Comparing base (2122c39) to head (83e23ff).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pycardano/backend/ogmios_v6.py	63.63%	4 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #449   +/-   ##
=======================================
  Coverage   89.98%   89.98%           
=======================================
  Files          33       33           
  Lines        4854     4855    +1     
  Branches      733      733           
=======================================
+ Hits         4368     4369    +1     
  Misses        314      314           
  Partials      172      172           

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[cffls]

Thanks for the contribution. I moved additional_header to the end of the argument list to make the change max backward compatible with existing code. Also fixed some formatting check failures.