Adding support for faas.invoke_duration metric

[RohitRanjanMS]

• Adding support for faas.invoke_duration metric.
• Updating attributes as per updated spec.
• Removed faas.version as it's no longer applicable.
• Setting http.route and display name.

resolves #10454

Pull request checklist

IMPORTANT: Currently, changes must be backported to the in-proc branch to be included in Core Tools and non-Flex deployments.

• Backporting to the in-proc branch is not required
  • Otherwise: Link to backporting PR
• My changes do not require documentation changes
  • Otherwise: Documentation issue linked to PR
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  • Otherwise: I've added my notes to release_notes.md
• My changes do not need to be backported to a previous version
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  • Otherwise: I have added/updated all related diagnostic events and their documentation (Documentation issue linked to PR)
• I have added all required tests (Unit tests, E2E tests)

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Additional PR information