Update crate name

[jazzz]

The current build artifacts being generated by libchat are causing confusion at higher layers as pointed out by @plopezlpz .

• Libchat was producing a dynamic library named liblogos_chat.* and
• logos_chat was producing a library called liblogoschat.*

This is because the crate name for libchat:conversations was named logos_chat.

This PR removes the confusion by renaming the crate to libchat which then produces liblibchat.* artifacts.

Notes:

• liblibchat might seem odd, but I believe this to make sense. Libchat follows the established repo naming scheme for backend support libraries. The artifacts follow the lib{project_name} format.

[jazzz]

Merging of this PR is blocked until @plopezlpz removes the DNM label. This change has impacts upstream consumers using dynamic linking.