fix: broken CLI in ESM projects since version 0.3

[giladgd]

Description of change

Using the CLI in ESM projects is broken in version 0.3.1, this PR fixes that.
The CLI currently tries to require( ... ) the data-source.ts file of the project regardless of the project type (CommonJS/ESM), the fix is to use the importOrRequireFile function instead.

Pull-Request Checklist

• Code is up-to-date with the master branch
• npm run format to apply prettier formatting
• npm run test passes with this change
• This pull request links relevant issues as Fixes #0000
• There are new or updated unit tests validating the change - This is problematic to test from within the module itself
• Documentation has been updated to reflect this change
• The new commits follow conventions explained in CONTRIBUTING.md

[pleerock]

thanks a lot