Add more documentation and tutorials for relayer-next

[seanchen1991]

Background

This issue tracks the work going into documenting the Hermes v1.5 code base. This work is part of the effort to make the code base more easily understandable for future end users and more easily maintainable by relayer developers.

Tasks

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1. Document the relayer-framework-test crate #28
   +0
   
2. Write the "Implementing a new relayer" tutorial section #33
   +0
   
3. Document constructs in ibc_relayer_framework::base::chain hermes#3033
   I: documentation O: relayer-next +2
   
4. Document constructs in ibc_relayer_framework::base::relay #26
   +0
   
5. Create a wiki that documents relayer-next #23
   +0
   
6. Document relayer-next's auto-relay functionality hermes#3193
   I: documentation O: relayer-next +2
   

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