feat: add AUTH_CLAWBACK_ENABLED_FLAG to AccountFlag.

[overcat]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.15%. Comparing base (b08a708) to head (f56119d).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #743   +/-   ##
=========================================
  Coverage     81.14%   81.15%           
  Complexity     1324     1324           
=========================================
  Files           214      214           
  Lines          5082     5083    +1     
  Branches        436      436           
=========================================
+ Hits           4124     4125    +1     
  Misses          701      701           
  Partials        257      257           

Files with missing lines	Coverage Δ
src/main/java/org/stellar/sdk/AccountFlag.java	100.00% <100.00%> (ø)
...rg/stellar/sdk/operations/SetOptionsOperation.java	88.00% <ø> (ø)

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