Improve packages build

[sebtiz13]

What does this PR do ?

Fix strange resolver behavior for package without main JS file, result in bug with Vite builder (and maybe other). CF: https://github.com/vitejs/vite/issues/12446

Assumption: When using import { MyType } from 'type-package', I think resolver try to resolve first in JS code before search in types. This problem does not occur when use import type { MyType } from 'type-package'; certainly because with explicit import type, the resolver search directly in types exports. So I have added an empty JS file to solve this behavior, but I think it's still better to use explicit import type (IMHO: it's also more explicit for developers readability)

Boyscout

• Add specific tsconfig for build to exclude tests code from build (useless to build test code and unnecessarily packaged in npm package)
• Remove useless npx command for prettier script

[sebtiz13]

There is an issue with functional tests

It's ok I have changed the method to exclude test code of package. I had not seen that the CI uses the built code for functional tests.