fix: prevent DoS attacks in Federation HTTP client

[overcat]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 76.11940% with 16 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.92%. Comparing base (028b666) to head (bf0f686).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
...java/org/stellar/sdk/requests/ResponseHandler.java	64.51%	8 Missing and 3 partials ⚠️
...in/java/org/stellar/sdk/federation/Federation.java	84.37%	2 Missing and 3 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #760      +/-   ##
============================================
- Coverage     81.02%   80.92%   -0.10%     
- Complexity     1397     1409      +12     
============================================
  Files           216      218       +2     
  Lines          5369     5411      +42     
  Branches        527      537      +10     
============================================
+ Hits           4350     4379      +29     
- Misses          716      725       +9     
- Partials        303      307       +4     

Files with missing lines	Coverage Δ
...exception/FederationResponseTooLargeException.java	100.00% <100.00%> (ø)
...ration/exception/StellarTomlTooLargeException.java	100.00% <100.00%> (ø)
...in/java/org/stellar/sdk/federation/Federation.java	82.22% <84.37%> (+0.55%)	⬆️
...java/org/stellar/sdk/requests/ResponseHandler.java	65.38% <64.51%> (-11.36%)	⬇️

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