The current documentation of the mempool is quite incomplete.

New content

• High-level architecture
• Interaction and dependencies with other modules/reactors
• Main data structures: clist, cache, ...
• Messages
• Main processes/functions
• Concurrency

DoD

• All main components of the current implementation are documented.
• The documentation can be used as a guide by CometBFT developers and users to understand the current implementation.
• Dependencies to other modules are identified.