clippy: allow large result errors in rpc and storage-bigtable

[kskalski]

Problem

Clippy in Rust toolchain 1.94 reports clippy:result-large-err warning for some of the large errors in rpc and storage-bigtable code.

Summary of Changes

Mark the affected code with #[allow(clippy::result_large_err)]

[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 @kskalski.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.1%. Comparing base (f1cf880) to head (10ce7c9).

Additional details and impacted files

@@            Coverage Diff            @@
##           master   #11191     +/-   ##
=========================================
- Coverage    83.1%    83.1%   -0.1%     
=========================================
  Files         837      837             
  Lines      317209   317209             
=========================================
- Hits       263711   263697     -14     
- Misses      53498    53512     +14     

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