Introduce a new lifecycle callback—`checkParserInst`—to perform
configuration sanity checks on parser instances immediately after they’re
created. This establishes a standardized validation point (similar to
`checkCnf` in other module types) without altering existing parser logic.
By wiring `checkParserInst` into:
- the module template (macros for definition and registration),
- the module loader (`doModInit`) with graceful fallback,
- the runtime configuration flow (`rsconf.c`) just after
`newParserInst`,
and by providing empty stubs in all current parser modules (contrib and
plugins), we now have a clear, uniform spot to add parser-specific
validation rules in subsequent patches. This improves future
maintainability and robustness of parser configuration handling.
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