klog WIP: structured error, funcr.PseudoStruct

What this PR does / why we need it:

Nicer formatting of error details.

Which issue(s) this PR fixes: Fixes #357

Special notes for your reviewer:

This is a variant of the idea with the existing funcr.PseudoType.

Release note:

MarshalLog may return funcr.PseudoType (aka funcr/types.PseudoType) and those key/value pairs then will get logged like a struct with those fields. When an error implements MarshalLog, it gets logged both as `err=<Error()>` and as `errDetails=<MarshalLog()>`.

Dec 06 '22 18:12 pohly

[APPROVALNOTIFIER] This PR is NOT APPROVED

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Dec 06 '22 18:12 k8s-ci-robot

/assign @harshanarayana /triage accepted

Dec 15 '22 17:12 dashpole

@pohly: PR needs rebase.

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Jun 03 '23 09:06 k8s-triage-robot

/remove-lifecycle rotten

Waiting for slog in Go 1.21.

Jun 03 '23 19:06 pohly

We could do this now, but I'd like to hear from @tallclair first whether this feature is really needed and going to be used.

Jan 10 '24 08:01 pohly

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Jun 08 '24 10:06 k8s-triage-robot

@k8s-triage-robot: Closed this PR.

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Jun 08 '24 10:06 k8s-ci-robot