breaking: rewrote channel_get_pins, added Pin Message permission, updated pin endpoints.

[Jaskowicz1]

This PR adds the new PIN_MESSAGES permission, and changes the get/set/unset pinned message endpoints to the new endpoints.

Because of the new endpoints, the channel_get_pins endpoint no longer returns the same data, meaning we now had to change this, causing a breaking change to make it conform to the new standard that Discord has set.

Code change checklist

• I have ensured that all methods and functions are fully documented using doxygen style comments.
• My code follows the coding style guide.
• I tested that my change works before raising the PR.
• I have ensured that I did not break any existing API calls.
• I have not built my pull request using AI, a static analysis tool or similar without any human oversight.

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[braindigitalis]

when it compiles, good to merge.
how far are we now from reaching the limit of uint64_t, they are going very close to 64 different unique permissions!

[Jaskowicz1]

Ikr, they getting close!

[Jaskowicz1]

Updated the PR's title and description.

[Jaskowicz1]

Actually im gonna put this back into draft, need to add the before and limit parameters.

[Jaskowicz1]

Just to note, I used std::optional<> on purpose as those fields are optional but we don't allow command_completion_event_t to be optional for getters.

I used uint64_t for the limit field because we've done the same above, but I can correct that if wanted (we only need it to be uint8_t really).

[braindigitalis]

ship it letsgoooooo