Manifest: Introduce octez-shell-libs, octez-proto-libs and octez-l2-libs

Context

Depends on !9325 (merged)

This merge request is included in the project of reducing the number of packages, which aims to create packages that contain sub-libraries of Octez that are related.

This merge request introduces new packages:

• Octez-shell-libs: Contains the libraries related to the shell of octez
• Octez-proto-libs: Contains the libraries related to the protocols.
• Octez-l2-libs: Contains the libraries related to the layer2 of Octez.

Manually testing the MR

• make -C manifest
• make
• Read the generated documentations to see the new packages descriptions

Checklist

• Document the interface of any function added or modified (see the coding guidelines)
• Document any change to the user interface, including configuration parameters (see node configuration)
• Provide automatic testing (see the testing guide).
• For new features and bug fixes, add an item in the appropriate changelog (docs/protocols/alpha.rst for the protocol and the environment, CHANGES.rst at the root of the repository for everything else).
• Select suitable reviewers using the Reviewers field below.
• Select as Assignee the next person who should take action on that MR