Plomin deser

[cffls]

Updates for new serializations introduced in Conway/Plomin HF. With this change, fields affected by new serialization spec will be encoded in the new format (tag.258) by default.

Spec reference: https://github.com/IntersectMBO/cardano-ledger/blob/9d65b0d9d1fb0a88f9a31cf2cdc684744e66dcea/eras/conway/impl/cddl-files/extra.cddl#L5-L12

[codecov]

Codecov Report

Attention: Patch coverage is 92.48120% with 10 lines in your changes missing coverage. Please review.

Project coverage is 84.04%. Comparing base (f21348f) to head (57bc0de).

Files with missing lines	Patch %	Lines
pycardano/serialization.py	87.50%	6 Missing and 4 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #420      +/-   ##
==========================================
- Coverage   87.42%   84.04%   -3.39%     
==========================================
  Files          32       31       -1     
  Lines        4341     4355      +14     
  Branches     1096     1102       +6     
==========================================
- Hits         3795     3660     -135     
- Misses        394      554     +160     
+ Partials      152      141      -11     

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