Add support for Clawback

[nkramer44]

Fixes #484

Adds support for the Clawback amendment.

Note: CI build will not pass on testnet until the amendment is enabled. We should not merge this PR until it is enabled on testnet, and maybe not until it is enabled on mainnet (if ever).

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.03% 🎉

Comparison is base (c0efe11) 90.46% compared to head (bf465d5) 90.50%.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #485      +/-   ##
============================================
+ Coverage     90.46%   90.50%   +0.03%     
- Complexity     1499     1504       +5     
============================================
  Files           289      290       +1     
  Lines          4259     4275      +16     
  Branches        351      353       +2     
============================================
+ Hits           3853     3869      +16     
  Misses          281      281              
  Partials        125      125              

Files Changed	Coverage Δ
...org/xrpl/xrpl4j/crypto/signing/SignatureUtils.java	99.59% <100.00%> (+0.01%)	⬆️
.../org/xrpl/xrpl4j/model/flags/AccountRootFlags.java	100.00% <100.00%> (ø)
...org/xrpl/xrpl4j/model/transactions/AccountSet.java	95.12% <100.00%> (+0.12%)	⬆️
...a/org/xrpl/xrpl4j/model/transactions/Clawback.java	100.00% <100.00%> (ø)
...rg/xrpl/xrpl4j/model/transactions/Transaction.java	100.00% <100.00%> (ø)
...rpl/xrpl4j/model/transactions/TransactionType.java	100.00% <100.00%> (ø)

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[sappenin]

LGTM