Check remote range end arithmetic

[fallintoplace]

Summary

• reject remote range requests whose inclusive end offset would overflow
• compute the CURLOPT_RANGE end offset only after the checked arithmetic passes
• add a regression test that exercises the shared HTTP/S3 range setup helper without performing a transfer

Validation

• pre-commit run --files cpp/src/remote_handle.cpp cpp/tests/test_remote_handle.cpp
• git diff --check

Not run locally: ci/run_ctests.sh -R REMOTE_HANDLE_TEST because no installed/devcontainer KvikIO test build was present at the paths searched by the script.

[copy-pr-bot]

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