Support tsconfig paths without baseUrl

[Janpot]

Describe the feature you'd like to request

Typescript supports paths without specifying baseUrl. This is interesting when you want to use some path aliases without allowing bare imports to resolve from the project root.

Describe the solution you'd like

next.js already supports paths with baseUrl. It could just follow what typescript does and resolve paths from the config location when baseUrl is not specified.

Describe alternatives you've considered

Configure baseUrl