chore: Use logutil-go for logging

[codecov[bot]]

Codecov Report

Patch coverage: 86.17% and project coverage change: -0.12 :warning:

Comparison is base (5901663) 94.06% compared to head (e8beb48) 93.95%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #695 +/- ## ========================================== - Coverage 94.06% 93.95% -0.12% ========================================== Files 81 79 -2 Lines 4685 4497 -188 ========================================== - Hits 4407 4225 -182 + Misses 160 154 -6 Partials 118 118 ``` | [Impacted Files](https://codecov.io/gh/trustbloc/sidetree-core-go/pull/695?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=trustbloc) | Coverage Δ | | |---|---|---| | [pkg/internal/log/fields.go](https://codecov.io/gh/trustbloc/sidetree-core-go/pull/695?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=trustbloc#diff-cGtnL2ludGVybmFsL2xvZy9maWVsZHMuZ28=) | `98.07% <ø> (-0.11%)` | :arrow_down: | | [pkg/log/log.go](https://codecov.io/gh/trustbloc/sidetree-core-go/pull/695?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=trustbloc#diff-cGtnL2xvZy9sb2cuZ28=) | `100.00% <ø> (ø)` | | | [pkg/restapi/common/httputil.go](https://codecov.io/gh/trustbloc/sidetree-core-go/pull/695?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=trustbloc#diff-cGtnL3Jlc3RhcGkvY29tbW9uL2h0dHB1dGlsLmdv) | `75.00% <ø> (ø)` | | | [pkg/versions/1\_0/txnprovider/handler.go](https://codecov.io/gh/trustbloc/sidetree-core-go/pull/695?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=trustbloc#diff-cGtnL3ZlcnNpb25zLzFfMC90eG5wcm92aWRlci9oYW5kbGVyLmdv) | `91.61% <66.66%> (ø)` | | | [pkg/observer/observer.go](https://codecov.io/gh/trustbloc/sidetree-core-go/pull/695?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=trustbloc#diff-cGtnL29ic2VydmVyL29ic2VydmVyLmdv) | `91.42% <75.00%> (ø)` | | | [.../versions/1\_0/operationapplier/operationapplier.go](https://codecov.io/gh/trustbloc/sidetree-core-go/pull/695?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=trustbloc#diff-cGtnL3ZlcnNpb25zLzFfMC9vcGVyYXRpb25hcHBsaWVyL29wZXJhdGlvbmFwcGxpZXIuZ28=) | `90.14% <81.81%> (ø)` | | | [pkg/processor/processor.go](https://codecov.io/gh/trustbloc/sidetree-core-go/pull/695?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=trustbloc#diff-cGtnL3Byb2Nlc3Nvci9wcm9jZXNzb3IuZ28=) | `93.86% <82.50%> (ø)` | | | [pkg/batch/writer.go](https://codecov.io/gh/trustbloc/sidetree-core-go/pull/695?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=trustbloc#diff-cGtnL2JhdGNoL3dyaXRlci5nbw==) | `91.12% <83.33%> (ø)` | | | [pkg/versions/1\_0/txnprovider/provider.go](https://codecov.io/gh/trustbloc/sidetree-core-go/pull/695?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=trustbloc#diff-cGtnL3ZlcnNpb25zLzFfMC90eG5wcm92aWRlci9wcm92aWRlci5nbw==) | `97.03% <86.66%> (ø)` | | | [pkg/batch/cutter/cutter.go](https://codecov.io/gh/trustbloc/sidetree-core-go/pull/695?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=trustbloc#diff-cGtnL2JhdGNoL2N1dHRlci9jdXR0ZXIuZ28=) | `93.10% <100.00%> (ø)` | | | ... and [7 more](https://codecov.io/gh/trustbloc/sidetree-core-go/pull/695?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=trustbloc) | | 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=trustbloc). 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=trustbloc)

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