Improve the testability and maintainability of relayer-next

[seanchen1991]

Background

This issue tracks the work going into making Hermes v1.5 more easily testable and maintainable.

Q1 Tasks

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1. Implement first iteration of MockChainContext hermes#2733
   O: relayer-next O: tests +2
   
2. MockChainContext improvements and fixes hermes#2957
   O: relayer-next O: tests +2
   
3. Split out OfaRuntime to base and full variants hermes#2930
   I: refactoring O: relayer-next +2
4. Move message building methods from relay context to chain context hermes#2983
   I: refactoring O: relayer-next +2
   
5. Add more MockChain tests hermes#3004
   O: relayer-next O: tests +2
   
6. Implement transaction sender components hermes#2730
   O: relayer-next +1
   
7. Improve logging traits and for structured logging in relayer-next hermes#3084
   O: relayer-next +1
   

Q2 Tasks

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1. Add integration test for ack packets getting relayed properly #32
   +0
2. Remove the write acknowledgement argument from AckPacketRelayer #35
   +0
   
3. Build a correct implementation of mock chain context for testing relayer-next #25
   +0
4. Implement a mock Cosmos chain context #24
   +0
   
5. Initial work on abstract test framework hermes#3151
   O: relayer-next O: testability +2
   
6. Benchmark relayer-next's performance #16
   +0
7. Run BinaryConnectionTest with current and next relayer context #14
   +0
8. Test relayer-next against BinaryChainTests

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