Basic metric reporting for indexer worker

[ghost]

• Fixes #36
• Reports on highest block, current block and number of blocks processed

[codecov[bot]]

Codecov Report

Base: 19.36% // Head: 19.23% // Decreases project coverage by -0.13% :warning:

Coverage data is based on head (650d9d3) compared to base (564147a). Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #91 +/- ## ========================================== - Coverage 19.36% 19.23% -0.14% ========================================== Files 10 10 Lines 1012 1019 +7 ========================================== Hits 196 196 - Misses 812 819 +7 Partials 4 4 ``` | [Impacted Files](https://codecov.io/gh/alicenet/utilities/pull/91?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=alicenet) | Coverage Δ | | |---|---|---| | [internal/service/worker/worker.go](https://codecov.io/gh/alicenet/utilities/pull/91/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=alicenet#diff-aW50ZXJuYWwvc2VydmljZS93b3JrZXIvd29ya2VyLmdv) | `0.00% <0.00%> (ø)` | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=alicenet). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=alicenet)

:umbrella: View full report at Codecov.
:loudspeaker: Do you have feedback about the report comment? Let us know in this issue.