Minor improvements to Hermes log output

[adizere]

Crate

ibc-relayer-cli

Summary

Two improvements to the log output, which we can do with low effort:

• enable colors in the the log output
• try to reduce the noice by removing some redundant information, e.g., the target field (usually it's the name of the crate + name of the module)

More details in the PR fixing this #1099.

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