azjezz / psl / 8557882543

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chore: miscellaneous changes (#458)

- marked some classes as `readonly`
- fixes invalid psalm annotations ( mainly related to pure/mutation-free )
- remove the use of promoted properties, this allows us to declare all properties using `camelCase` while still using `snake_case` for arguments.
- declare some classes as immutable/mutation-free
- declare some methods as mutation-free/pure
- declare some functions as mutation-free/pure
- remove redudnant type checks in `Option::unzip` as it is verified using `@psalm-if-this-is`
- introduced `Class\is_readonly` function.

Signed-off-by: azjezz <azjezz@protonmail.com>

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