feat: Vendor TraceKit

[kinyoklion]

This PR vendors tracekit to alleviate some issues with ESM compatibility.
Currently the typescript conversion is minimal. It adds the types which are largely compatible and leaves most of it reasonably unchanged.

This PR does not port the tests from tracekit to this repository. A subsequent PR will do this.

BEGIN_COMMIT_OVERRIDE
feat: Vendor TraceKit
feat: Export browser-telemetry initialization method.
END_COMMIT_OVERRIDE

Jira: EMSR-14
Jira: EMSR-15

[github-actions]

@launchdarkly/js-sdk-common size report
This is the brotli compressed size of the ESM build.
Size: 19014 bytes
Size limit: 21000

[github-actions]

@launchdarkly/js-client-sdk-common size report
This is the brotli compressed size of the ESM build.
Size: 15354 bytes
Size limit: 20000

[github-actions]

@launchdarkly/js-client-sdk size report
This is the brotli compressed size of the ESM build.
Size: 19814 bytes
Size limit: 21000

[kinyoklion]

Aside from type annotations the only functional changes in this file are additional conversion checks to match the expected types in the original code.

Additionally the module support has been removed, and assigning to window has been removed, and a function was added to get the tracekit instance versus exporting it.

The problem with modules was that they are imported immutably, so we could not do things like adjust the context lines which required assignment to an import.