Externalize all imported packages in sst.config.ts

We had to roll this one back because of how some people where using NX or other mono repo setups to include reusable sst constructs from a @myorg/infra which pointed to a local monorepo package.

From what I understood this caused esbuild to think that it was an external package and maybe because it was pointing to a typescript file instead of a compiled file, it gave the error

Error       
|  TypeError: Unknown file extension ".ts" for /Users/user/my-app/infra/mod.ts
|      at Object.getFileProtocolModuleFormat [as file:] (node:internal/modules/esm/get_format:160:9)
|      at defaultGetFormat (node:internal/modules/esm/get_format:203:36)
|      at defaultLoad (node:internal/modules/esm/load:143:22)
|      at ModuleLoader.load (node:internal/modules/esm/loader:396:7)
|      at ModuleLoader.moduleProvider (node:internal/modules/esm/loader:278:45)
|      at link (node:internal/modules/esm/module_job:78:21) {
|    code: 'ERR_UNKNOWN_FILE_EXTENSION'
|  }

I'm not sure how we can get esbuild to only use external packages, but only if they are not local?

sst / ion

Externalize all imported packages in sst.config.ts #569