error: Refactor the overarching litep2p::Error

[lexnv]

The litep2p::Error contains multiple variants that grow over time.

Clean up the error into something more coherent and group errors by individual components / use-case, similar to the DialError.

This will help us provide more descriptive error messages and identify easily the place of occurrence:

litep2p/src/error.rs

Line 43 in c9e7aff

pub enum Error {

Tasks

• errors: Add DialError error and ListDialFailures event for better error reporting #206
• errors: Introduce immediate dial error and request-response rejection reasons #227