rust-chg: add state machine to handle "runcommand" request with cHg extension
This is modeled after tokio-hglib's RunCommand state to support the "S"
channel message.
BasedOnStyle: LLVM
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BreakBeforeBraces: Linux
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IndentCaseLabels: false
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AllowShortFunctionsOnASingleLine: false
IncludeCategories:
- Regex: '^<'
Priority: 1
- Regex: '^"'
Priority: 2