chore(sequencer): add instrumentation

[ethanoroshiba]

Summary

Added instrumentation to most async functions which did not have it.

Background

Adding instrumentation to all async calls will aid in tracing since spans will be emitted even if no events happen under them.

Changes

• Added instrumentation to most async functions which did not have it.
• Added err argument to the instrument macro where applicable.
• Added fields to the instrument macro where applicable.

Testing

Passing all tests.

Changelogs

No updates required

Related Issues

closes #1321

[Fraser999]

Blocking this for now (as much a reminder to myself as anything else).

Discussed offline with @ethanoroshiba that this will be revisited to ensure we're only using error-level instrumentation where it's warranted (i.e. where it indicates a serious problem or bug in the logic) and not for non-critical cases (e.g. handling a malformed client request).