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refactor: Use pointers for parser state and location (#5)

* refactor: Use pointers for parser state and location

Updated various struct methods, including `State`, `Location`, and
`ParseError`, to use pointer receivers (`*Type`).

This modification:

*   Avoids unnecessary copying of potentially large structs.
*   Makes `State.advanceRune` return `*State` for consistent state
    management.

* refactor: Change Parser input from State to *State

The parser library previously passed the `State` struct by value,
causing significant copying overhead during parsing operations.

This commit changes the fundamental signature of the `Parser` type
and related functions (e.g., `success`, `failT`, `NewState`) to use
`*State` (a pointer).

This effectively changes the input mechanism from pass-by-value
to pass-by-reference, improving parsing performance.

* refactor: Use pointer for State input string

This refactors the `State` structure to hold a pointer to the input
string instead of the string value itself.

This change ensures that the parsing state holds a reference to the
input, which avoids potentially unnecessary string copies when
creating new `State` instances.

33 of 39 new or added lines in 5 files covered. (84.62%)

295 of 391 relevant lines covered (75.45%)

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