Export ESM only and improve things

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The CJS build did not work because of ESM dependencies, so I decided to only export ESM. An app using isolate from a CJS environment can use a dynamic import.

• Replace lodash-es with ramda (since it is already a dependency for the pnpm modules, and is an improvement)
• Fix dev dependencies that should have been regular deps
• Remove path alias, since it is unnecessary complexity for a mostly flat codebase like this
• Export a type describing the module exports, so that we can cast the result of the firebase-tools dynamicImport function.