Customize logging colors

[TobiWo]

/release

Summary

This PR adds three new cli flags to customize the logging colors for the duty logs.

In particular this PR adds:

• flag --log-color-warning
  • modifies the logging color of attestation and proposing duty logs where the duty is due in less than 2 min.
  • and for the sync committee duty log if your validator is in the next sync committee
• flag --log-color-critical
  • modifies the logging color of attestation and proposing duty logs where the duty is due in less than 1 min.
  • and for the sync committee duty log if your validator is in the current sync committee
• flag --log-color-proposing
  • modifies the logging color of proposing duty logs if duty is due in more than 2 min.
• colors should be provided in:
  • RGB format e.g. --log-color-warning 255,255,255 or
  • hex format e.g. --log-color-warning "#FFFFFF"
    • Note: You need to wrap the hex code in quotes or double quotes or use a = between the flag and the value like --log-color-warning=#FFFFFF