feat: add rudimentary decoding for stake txs

[compojoom]

Instead of showing “unknown operation” we now display the type of stake tx.
Without this any stake TXs are shown as unkown operations:

With the changes stake txs are shown as follows:

Changes proposed in this pull request:

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.11%. Comparing base (bb1554a) to head (0252425).
Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##            main    #3445       +/-   ##
==========================================
+ Coverage   8.10%   95.11%   +87.00%     
==========================================
  Files        796       29      -767     
  Lines      45050     1452    -43598     
==========================================
- Hits        3650     1381     -2269     
+ Misses     41400       71    -41329     

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