Make ZetaClient logging and metrics clear, informative, and easy to read for monitoring

[lumtis]

Creating a new EPIC to make this one focused on code structure and testing: https://github.com/zeta-chain/node/issues/1611

This EPIC aims at improve the general logging and metrics of the ZetaClient

### Tasks
- [ ] https://github.com/zeta-chain/node/issues/1869
- [ ] https://github.com/zeta-chain/node/issues/1622
- [ ] https://github.com/zeta-chain/node/issues/1495
- [ ] https://github.com/zeta-chain/node/issues/2031
- [ ] https://github.com/zeta-chain/node/issues/1902

[CharlieMc0]

Improvement Examples here - https://github.com/zeta-chain/node/issues/1902