rpc-client-api: reexport publicly used types

[kevinheavey]

Similar to #7737

[mergify]

If this PR represents a change to the public RPC API:

1. Make sure it includes a complementary update to rpc-client/ (example)
2. Open a follow-up PR to update the JavaScript client @solana/kit (example)

Thank you for keeping the RPC clients in sync with the server API @kevinheavey.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.0%. Comparing base (7eb0faa) to head (70dbbe9).
⚠️ Report is 2348 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #7808   +/-   ##
=======================================
  Coverage    83.0%    83.0%           
=======================================
  Files         812      812           
  Lines      357194   357194           
=======================================
+ Hits       296736   296818   +82     
+ Misses      60458    60376   -82     

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[joncinque]

Looks great! Confirming the rest of the crate is properly re-exporting publicly used types