Loading workerContext using the Knowledge manager

[nsabale7]

IMPORTANT: All PRs must be linked to an issue (except for extremely trivial and straightforward changes).

Fixes #2448

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[owais-vd]

@nsabale7 just a question about the worker-context. I'm not sure why we created two different worker-context.

1. https://github.com/google/android-fhir/pull/2449/files#diff-0abdac65d1f5c5a9700253625ed1b9d36a465bc0b5fec7e7e9cf26c5abc02779R36
2. https://github.com/google/android-fhir/pull/2449/files#diff-63f547d1547f3d76757693a33c9f6ff6b911b03ab2aa4280843f9ddcddee3821R201

It shouldn't be one? and where the loadWorkerContext method is being called?

[nsabale7]

1. https://github.com/google/android-fhir/pull/2449/files#diff-0abdac65d1f5c5a9700253625ed1b9d36a465bc0b5fec7e7e9cf26c5abc02779R36 A. This defines a default simple worker-context object which does not load any packages.
2. https://github.com/google/android-fhir/pull/2449/files#diff-63f547d1547f3d76757693a33c9f6ff6b911b03ab2aa4280843f9ddcddee3821R201 A. This worker-context loads provided npmPackages and returns the object.

[jingtang10]

fyi left a comment in the issue: https://github.com/google/android-fhir/issues/2448#issuecomment-1979375776

i think we need to resolve this before we can merge this pr

[nsabale7]

@joiskash @owais-vd @dubdabasoduba @jingtang10 I have added test using outbreak package. Please review this PR.