Third party assets that rely on extra script files for functionality cannot be used sorry, so you would only be able to use the TMP Essential Resources (multiple shader scripts are fine). The TMP Examples & Extras package has a range of various scripts included, so those scripts you would not be able to implement into your project.
If you use a third party asset that includes script files, but they do not impact your implementation of the asset - just delete the scripts imported with the package, so that your single game script is the only script file in the project.
