Add error buffer util

[essamhassan]

This util makes use of the go1.20 error changes and expose a ring buffer interface for errors. This can be useful for tracking latest K crits on a service. Next steps is including this as part of startstoponce iface

Example Usage

		buff := utils.ErrorBuffer{Cap: 2}
		buff.Append(err1)
		buff.Append(err2)
		combined := buff.Flush() // []error
		errs := utils.UnwrapError(combined) // if combined is a joinedErr, return combined.Unwrap() otherwise return []error{combined}

Go errors @1.20

[github-actions]

I see that you haven't updated any CHANGELOG files. Would it make sense to do so?

[cl-sonarqube-production]

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80.0% Coverage on New Code (is less than 90%)

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