Login and Logout handler

[zg009]

New feature description

Addresses https://github.com/inrupt/solid-client-authn-js/issues/422 The simplest approach was to add an entirely new EVENTS const which is simply emitted at all locations along with the login and logout existing events. I was unable to run the E2E tests, I figure it was due to the confusion on provisioning the pod base uri. I added unit tests which passed under Jest, and conformed to the existing test structure. The commit messages could be improved upon. I can create a new fork if needed.

Checklist

• [?] All acceptance criteria are met.
• [X] Relevant documentation, if any, has been written/updated.
• [x] The changelog has been updated, if applicable.
• [X] New functions/types have been exported in index.ts, if applicable.
• [x] Commits in this PR are minimal and have descriptive commit messages.

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[zg009]

I do not know how to add a changelog entry, sorry. I am also unsure what configs are conflicting in the e2e-test file