feat: add support for Soroban PRC's getLedgers API interfaces.

[overcat]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.66%. Comparing base (121f459) to head (a75a1ac).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #992   +/-   ##
=======================================
  Coverage   98.66%   98.66%           
=======================================
  Files         253      253           
  Lines       13374    13429   +55     
=======================================
+ Hits        13195    13250   +55     
  Misses        179      179           

Flag	Coverage Δ
unittests	98.66% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
stellar_sdk/soroban_rpc.py	100.00% <100.00%> (ø)
stellar_sdk/soroban_server.py	94.54% <100.00%> (+0.25%)	⬆️
stellar_sdk/soroban_server_async.py	97.27% <100.00%> (+0.12%)	⬆️
tests/test_soroban_server_async.py	100.00% <100.00%> (ø)
tests/test_soroban_server_sync.py	100.00% <100.00%> (ø)