feat: add support for CAP-23

[overcat]

No description provided.

[codecov]

Codecov Report

Merging #371 into dev-protocol-14 will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@                 Coverage Diff                 @@
##           dev-protocol-14     #371      +/-   ##
===================================================
+ Coverage            98.95%   99.00%   +0.04%     
===================================================
  Files                  119      121       +2     
  Lines                 6817     7117     +300     
===================================================
+ Hits                  6746     7046     +300     
  Misses                  71       71              

Flag	Coverage Δ
#unittests	99.00% <100.00%> (+0.04%)	⬆️

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Impacted Files	Coverage Δ
stellar_sdk/operation/__init__.py	100.00% <100.00%> (ø)
stellar_sdk/operation/claim_claimable_balance.py	100.00% <100.00%> (ø)
stellar_sdk/operation/create_claimable_balance.py	100.00% <100.00%> (ø)
stellar_sdk/transaction_builder.py	100.00% <100.00%> (ø)
tests/test_operation.py	100.00% <100.00%> (ø)
tests/test_transaction_builder.py	100.00% <100.00%> (ø)