feat(instrumentation): Add allowUrls config option to web instrumentation

[jairo-mendoza]

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Which problem is this PR solving?

This change provides easier control over which urls should have spans created for it. It can also be used with ignoreUrls for more granular control.

Fixes #4899

Short description of the changes

Added allowUrls as a config option to both the XMLHttpRequestInstrumentation and FetchInstrumentation classes.

Addition of the isUrlAllowed function in the core package that both the fetch and xhr instrumentation will depend on.

Type of change

Please delete options that are not relevant.

• [x] New feature (non-breaking change which adds functionality)
• [x] This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• [x] Unit tests for both xhr and http instrumentation have been added
• [x] Tweaked opentelemetry-web examples (fetch and xml-http-request) to accept multiple URLs. Then I added the allowUrls config option on the instrumentation set up and verified that traces were being created (or not created).

Checklist:

• [x] Followed the style guidelines of this project
• [x] Unit tests have been added
• [ ] Documentation has been updated

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