Add in code attributes to exception event #1981

[thompson-tomo]

Fixes #1981

Changes

Adds in the code attributes to the exception event as opt-in

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• CONTRIBUTING.md guidelines followed.
• Change log entry added, according to the guidelines in When to add a changelog entry.
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• Links to the prototypes or existing instrumentations (when adding or changing conventions)

[github-actions]

This PR contains changes to area(s) that do not have an active SIG/project and will be auto-closed:

• exceptions

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[thompson-tomo]

@joaopgrassi can this be reopened. The issue has been accepted but pr still got closed.

[trask]

are there any prototypes / usages of this in instrumentation under the open-telemetry org?

[thompson-tomo]

I had thought the javascript were using them based on the closed pr but it was taken out.

As such I have extended the existing otel contrib lib to map additional properties from ErrorEvent to otel attributes as seen in this commit