[rust] add `is_success` and `is_failure` methods for `ParseResult`#3888

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sei40kr wants to merge 2 commits intoruby:mainfrom

sei40kr:feat/rust-parse-result-success-failure

Commits on Jan 29, 2026

feat: add `node_ext` module with `full_name` methods for constant nodes

sei40kr
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claude
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feat: add `is_success` and `is_failure` methods for `ParseResult`

sei40kr
and
claude
committed