Revisit ESLint rules

[Siegrift]

Add:

• https://github.com/gajus/eslint-plugin-zod
• Consistent quotes (", ', `)

and look at disabled rules (and eslint-disable directives) in signed API and airseeker repositories and consider disabling them in commons.

Remove:

• Disabled rules in signed API and Airseeker
• jest empty test -> test.todo (its annoying)

[dcroote]

Close now that the eslint plugin has moved? The referenced zod plugin doesn't look maintained anyway (11 commits total, last one 2 yrs ago).

[Siegrift]

I think this part:

Remove: Disabled rules in signed API and Airseeker jest empty test -> test.todo (its annoying)

and also:

Consistent quotes (", ', `)

is still valid. Let me move the issue instead.