Add relayer version metric + dashboard.

[dzmitryhil]

Description

Add relayer version metric + dashboard.

Reviewers checklist:

• Try to write more meaningful comments with clear actions to be taken.
• Nit-picking should be unblocking. Focus on core issues.

Authors checklist

• Provide a concise and meaningful description
• Review the code yourself first, before making the PR.
• Annotate your PR in places that require explanation.
• Think and try to split the PR to smaller PR if it is big.

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This change is 

[ysv]

Reviewed 7 of 7 files at r1, all commit messages.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @dzmitryhil, @masihyeganeh, @miladz68, and @wojtek-coreum)

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infra/composer/grafana/dashboards/relayer.json line 1721 at r1 (raw file):

          "selected": true,
          "text": [
            "devcore1l9d79mawwv2lhel5eh9z0mp0fpff7pz7grm5tm"

are these hardcoded values expected here ?

I think Artem will just copy these

[dzmitryhil]

Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @masihyeganeh, @miladz68, @wojtek-coreum, and @ysv)

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infra/composer/grafana/dashboards/relayer.json line 1721 at r1 (raw file):

Previously, ysv (Yaroslav Savchuk) wrote…

are these hardcoded values expected here ?

I think Artem will just copy these

Removed.

[ysv]

Reviewed 1 of 1 files at r2, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @masihyeganeh, @miladz68, and @wojtek-coreum)

[miladz68]

Reviewed 6 of 7 files at r1, 1 of 1 files at r2, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @masihyeganeh and @wojtek-coreum)

[miladz68]

Reviewed 3 of 3 files at r3, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @masihyeganeh and @wojtek-coreum)