feat(lint): add eslint

[lucbpz]

What does this PR do?

• Adds eslint to our configuration so that every file has the same format.
• Adds prettier.
• Bumps the docker theme version and remove ts-expect-error from the docker palette.
• Fix all TS errors.

Notes

• Make sure you have the Prettier VSCode extension.
• I haven't added anything to our GH Actions yet - we can do it in a separate PR.

[github-actions]

Docker image tag(s) pushed:

docker/volumes-backup-extension:pr-56

Labels added to images:

org.opencontainers.image.title=volumes-backup-extension
org.opencontainers.image.description=Back up, clone, restore, and share Docker volumes effortlessly.
org.opencontainers.image.url=https://github.com/docker/volumes-backup-extension
org.opencontainers.image.source=https://github.com/docker/volumes-backup-extension
org.opencontainers.image.version=pr-56
org.opencontainers.image.created=2022-09-01T15:35:15.837Z
org.opencontainers.image.revision=2516c946190e16a708db6bc11800f2587b9c3765
org.opencontainers.image.licenses=Apache-2.0

[benja-M-1]

nit: I just reviewed https://github.com/docker/mercury-ui/pull/3852 which advocates to use function declaration over function expression. I guess it is too late to change it everywhere, but should we consider to move everything to the function declaration?

[lucbpz]

Yes, I believe this could have a bigger impact on large codebases (pinata / hub) and although by having it here we can have consistency on how we write our code I wouldn't worry too much about extensions (or at least the ones already built). When we have a linter rule that forces that we can include it here as well. WDYT?

[felipecruz91]

LGTM! When running npm start the project compiled successfully and no issues were found 👍