decode message flags

[lara-rium]

closes #711

i looked at user flags impl and reflected those on message but some things may be missing. pls lmk upon review. also sorry ab the messy revert commits, forgot to create different branches for each pr

[Copilot]

Pull request overview

Adds support for exposing Discord message flags in Nostrum.Struct.Message and introduces a dedicated Nostrum.Struct.Message.Flags helper module to convert between the integer bitfield and a boolean-flag struct.

Changes:

• Introduce Nostrum.Struct.Message.Flags with from_integer/1 and to_integer/1 helpers.
• Add a :flags field (raw bitfield integer) to Nostrum.Struct.Message and attempt to cast it during to_struct/1 and update merges.
• Add a message flags type to the struct typespecs.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 6 comments.

File	Description
lib/nostrum/struct/message/flags.ex	New helper struct/module for converting message flags between bitfield integers and booleans.
lib/nostrum/struct/message.ex	Adds :flags to the message struct and attempts to cast it during struct construction/updates.

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[jchristgit]

Thank you for the pull request!

Clanker comments are mostly fine, to be honest. I'm positively surprised. See my comments below.

We should think about whether we want the flags field in the Message to automatically be decoded. Right now, from my understanding, they are just being kept as-is.

[lara-rium]

this should resolve all the comments, pls let me know if i need further adjustments

[lara-rium]

We should think about whether we want the flags field in the Message to automatically be decoded. Right now, from my understanding, they are just being kept as-is.

i just copied over from user, which also keeps it as it is. if we wanna discuss this i think we should do it in another issue cos it'd affect other flags as well. im also not very happy with this approach bc it involves copy/pasting the same to_integer and from_integer functions