Simplifies the backend interface (use available classes!)

[nielstron]

This is a minimal effort change to the backends to leverage the available classes in PyCardano for user-friendliness

In particular, if a class for something is available then the backend should support it

[codecov-commenter]

Codecov Report

Merging #206 (153f671) into main (090879e) will increase coverage by 0.00%.
The diff coverage is 90.00%.

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@@           Coverage Diff           @@
##             main     #206   +/-   ##
=======================================
  Coverage   85.59%   85.59%           
=======================================
  Files          26       26           
  Lines        2846     2853    +7     
  Branches      677      677           
=======================================
+ Hits         2436     2442    +6     
- Misses        303      304    +1     
  Partials      107      107           

Impacted Files	Coverage Δ
pycardano/txbuilder.py	90.15% <66.66%> (ø)
pycardano/backend/base.py	98.63% <90.90%> (-1.37%)	⬇️
pycardano/backend/blockfrost.py	31.49% <100.00%> (ø)
pycardano/backend/ogmios.py	58.84% <100.00%> (ø)

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[nielstron]

As you can see from the code changes, the number of occurrences where the code is called with cbor instead of a Transaction object is actually 0. Almost the same for addresses.

[cffls]

Thanks! LGTM. This is a breaking change. Will include it in v0.9.