Write tests for lib-didi utils

[adam-cyclones]

Now that didi has the ability to run jest tests, it's time to write some. To start with something simple, test the utils which are fairly generic. Thanks to our new docs I can tell you that the tests needed are for the following files:

• "lib-didi/src/utils/alphaSortObject"
• "lib-didi/src/utils/errors/DidiCompilerPanic"
• "lib-didi/src/utils/errors/DidiPermissibleError"
• "lib-didi/src/utils/isCoreModule"
• "lib-didi/src/utils/mkdirESModules"
• "lib-didi/src/utils/removeCoreModules"
• "lib-didi/src/utils/toESM"
• "lib-didi/src/utils/toExtMJS"
• "lib-didi/src/utils/writeESModule"
• "lib-didi/src/utils/writeImportMap"
• "lib-didi/src/utils/writeIndexHTML"
• "lib-didi/src/utils/writeModuleEntry"