fix: add validation for ManageDataOperation value length to ensure …

[overcat]

…it does not exceed 64 bytes.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.01%. Comparing base (4721655) to head (e51312b).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #754      +/-   ##
============================================
+ Coverage     80.97%   81.01%   +0.04%     
  Complexity     1398     1398              
============================================
  Files           216      216              
  Lines          5372     5374       +2     
  Branches        527      528       +1     
============================================
+ Hits           4350     4354       +4     
+ Misses          719      718       -1     
+ Partials        303      302       -1     

Files with missing lines	Coverage Δ
...rg/stellar/sdk/operations/ManageDataOperation.java	100.00% <100.00%> (+9.52%)	⬆️

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