feat(plugin-lighthouse): add lighthouse plugin

[BioPhoton]

This PR includes all remaining snippets and docs to release the Lighthouse plugin.
In the process of comparing the code with the existing plugins I renamed and moved a couple of files. To get a better overview I grouped the changes as seen below.

Polish from #549:

• feat(plugin-lighthouse): add lighthouse runner #549 (comment)

Moving existing code:

• introduced runner folder to encapsulate lighthouse only related logic and types

Removed code:

• removed unused getLighthouseCliArguments function (better types and direct derivation from lighthouse made it obsolete)

New code in tests:

• e2e tests in cli-e2e
• covered edge case in getConfig with error
• added unit tests to getConfig
• changed a couple of test names to better readability and narrowed their case (mostly runner utils)

New code in logic:

• added helper functions to create CategoryRefs
• docs
• installed dev dependency @types/debug for better typing
• I implemented normalisation and refactored the incoming and forwarded flag types
• adjust runtime error message for lighthouse plugin as it was not clear which plugin it came from

Note

The e2e tests of compare are hard to change as they require a clean history to run. This could get discussed on how to fix it.

Followup changes:

• Lighthouse plugin ignores skipAudits #598

closes #90

[Tlacenka]

The last commented changes can be done in a follow-up PR.

[BioPhoton]

The following comments will get addressed in a followup PR:

• feat(plugin-lighthouse): add lighthouse plugin #593 (comment)
• feat(plugin-lighthouse): add lighthouse plugin #593 (comment)