Ignore some of the @typescript-eslint rules on existing
JavaScript files.

This script copies all files which are not source files from `generators/` to the build
output folder `dist`. This is needed since TypeScript only places the generated
JavaScript files in the `dist` folder but other files from
`generators/` are also needed in the output.

Don't copy files ending with .snap and folders starting with __ (currently __snapshots__ & __workflow)  to build output. These are files needed for tests or CI which have no use in the build output.

When using the build output for these exports the tests which import
these modules as part of the test case fail.

This has two reasons:
1. In CI/CD npm run build is not run before the tests so the
   modules fail to be imported. This could be solved by first building
   the package.
2. In the tests the modules are imported via ES Modules syntax and the
   import function and the result is compared for referential equality.
   When the built file is imported through the import function and
   it's compared to the source file the reference is always
   not the same.

When this part of the code is converted to TypeScript these issues must
be addressed.

This will build the project when it's installed.

This should be done by the prepare npm script now.