chore: added rootDir to all tsconfig files

[gpaoloni]

Description

This PR adds rootDir property to all our tsconfig files.
This is in order to avoid importing resources from other projects, which should instead be imported using the proper package name, like @tech-matters/.... The reason is that referencing a module in a different package directly by a path rather than via it's package reference cause TS to compile with a higher root directory & break when deployed - since the Dockerfile expects the plain root directory resulting from the compile step.

[stephenhand]

Thanks Gian!