add request labeling service/framework

[kaushalmahi12]

Description

This PR provides the foundational support to add multitenant labels to ThreadContext. This foundation provides a way to implement the LabelingPlugin to define how to compute these labels using implicit/explicit attributes.

Related Issues

Resolves #13341

Check List

• [X] Functionality includes testing.
• [ ] API changes companion pull request created, if applicable.
• [ ] Public documentation issue/PR created, if applicable.

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