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export ErrTagNotExist and ErrKeyNotExist sentinel errors - #29
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Fixes #24.
Export sentinel errors returned by Parse, Get, and Set (ErrTagNotExist, ErrKeyNotExist, ErrKeyNotSet, ErrTagSyntax, ErrTagKeySyntax, ErrTagValueSyntax, and ErrTagKeyMismatch).
This allows callers to inspect errors using errors.Is(err, structtag.ErrTagNotExist) and errors.Is(err, structtag.ErrKeyNotExist) rather than string comparisons against error messages.
Internal references and unexported alias identifiers (errTagNotExist, errKeyNotExist, errKeyNotSet, etc.) remain defined for backward compatibility. Unit tests verify error matching via errors.Is.