feat: add field attachment_size_limit to dpp::interaction

[usyless]

Add the field attachment_size_limit to dpp::interaction, allowing all interactions to have the current response attachment size limit in bytes

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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[Mishura4]

Looks good to me, thanks for the contribution!

[usyless]

oops, seems ive introduced an initialisation ordering warning, should i fix it?

[Mishura4]

For sure

[Mishura4]

Thanks for checking 👀 I'm now wondering why we don't have it set as error

[usyless]

Alright! Well im glad at least i found something... also rip the macos build at least that error isn't me

[braindigitalis]

only thing to change is the defines

[usyless]

I'm unsure about size_t here, although as it is only ever compared against another size_t (and is a constant) i used it

[braindigitalis]

these look fine to me now