feat: metrics

[mpetrun5]

Implement expanded set of metrics.
Most of the changes pertain to integrating the latest sygma-core package and adding timestamp
to messages.

Sygma relayer specific metrics are the only ones implemented on the sygma relayer.

Description

Related Issue Or Context

Closes: #373
Closes: #372
Closes: #371
Closes: #369
Closes: #370

How Has This Been Tested? Testing details.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation

Checklist:

• I have commented my code, particularly in hard-to-understand areas.
• I have ensured that all acceptance criteria (or expected behavior) from issue are met
• I have updated the documentation locally and in docs.
• I have added tests to cover my changes.
• I have ensured that all the checks are passing and green, I've signed the CLA bot

[github-actions]

Go Test coverage is 66.8 %\ ✨ ✨ ✨

[github-actions]

Go Test coverage is 66.8 %\ ✨ ✨ ✨