feat: support for checking message capping and reachout timelock limits

[gusquadri]

Adds support for checking account messaging limits through MEX.

It introduces:

• helper to fetch new chat message capping information
• helper to fetch account reachout timelock information
• typed response models for both payloads

This was discovered in collaboration with @purpshell and other community members.
It should help users handle error 463 by allowing them to manually check these limits on the implementation side.

[purpshell]

Related/based on: WhiskeySockets/Baileys#2442

[purpshell]

Good implementation

[zhamghaoran]

If you have any questions, I can provide some of the XML messages for these messages.
Previously, I processed these messages by querying logs, but now I can finally integrate them into the program!!!