feat: add support for Soroban PRC's getVersionInfo API.

[overcat]

No description provided.

[overcat]

#644

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.87%. Comparing base (b7b15ef) to head (56a52f7).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #645   +/-   ##
=========================================
  Coverage     80.86%   80.87%           
- Complexity     1170     1171    +1     
=========================================
  Files           202      202           
  Lines          4431     4433    +2     
  Branches        368      368           
=========================================
+ Hits           3583     3585    +2     
  Misses          618      618           
  Partials        230      230           

Files with missing lines	Coverage Δ
src/main/java/org/stellar/sdk/SorobanServer.java	83.53% <100.00%> (+0.20%)	⬆️
...ar/sdk/responses/sorobanrpc/GetEventsResponse.java	66.66% <ø> (ø)
...responses/sorobanrpc/GetLedgerEntriesResponse.java	100.00% <ø> (ø)
...k/responses/sorobanrpc/GetTransactionResponse.java	100.00% <ø> (ø)
.../responses/sorobanrpc/SendTransactionResponse.java	100.00% <ø> (ø)
...ponses/sorobanrpc/SimulateTransactionResponse.java	81.25% <ø> (ø)