Simplify @example import replacement

[m-bock]

We need to assure many possible import statements are replaced correctly:

• single/double quotes
• scoped/unscoped package name
• with or without /lib
• with or without a trailing path

As writing out tests manually for all those combinations would be a bit too much. I tried to abstract the tests a bit to reduce boilerplate. Since Jest 26 there is a feature available that works well for this purpose: https://jestjs.io/docs/api#testeachtablename-fn-timeout

For this I had to upgrade Jest and and adjust a few places in the codebase to make the tests work with the new version.

Finally the actual implementation of the replacement logic is a single regex and one replacement call.

[IMax153]

This PR LGTM at this point, I would just like @gcanti to review prior to merging since we are resolving a bug here.

[IMax153]

Thanks @thought2, @gcanti, and @gillchristian! PR is merged 👍

[gcanti]

Released, thank you 👍

[m-bock]

nice! And thanks for the invite to collaborate!