Specify `analyze_t` in `Xid` parsing rules

[nvmkuruc]

Description of Change(s)

PEGTL offers an analyze utility that can detect some errors in grammars. It requires a hint about how a grammar matches against its input via analyze_t. Rules that consume input that it matches against are classified as "any" rules.

This change updates the XidStart and XidContinue rules defined in the path parser and adds a call to analyze() in testSdfPathParser. analyze() returns 0, if there are no errors. Updating the path grammar will allow the forthcoming PEGTL parser #3005 to similarly validate against analyze().

Fixes Issue(s)

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• [ ] I have verified that all unit tests pass with the proposed changes
• [x] I have submitted a signed Contributor License Agreement

[jesschimein]

Filed as internal issue #USD-9553

[jesschimein]

/AzurePipelines run

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[nvmkuruc]

This works with the old PEGTL implementation, but not the new one. analyze has been moved to contrib/analyze.hpp