Support v20.x as an external loader

[legendecas]

When use node --import=amaro/strip index.ts in Node.js v20.x, it still reports that .ts extension is not supported.

It will be great that if amaro can be used in v20.x as an external loader to support type stripping.

node:internal/modules/run_main:123
    triggerUncaughtException(
    ^
TypeError [ERR_UNKNOWN_FILE_EXTENSION]: Unknown file extension ".ts" for /workspace/nodejs/node-api-cts/implementors/node/run-tests.ts
    at Object.getFileProtocolModuleFormat [as file:] (node:internal/modules/esm/get_format:189:9)
    at defaultGetFormat (node:internal/modules/esm/get_format:232:36)
    at defaultLoad (node:internal/modules/esm/load:145:22)
    at async nextLoad (node:internal/modules/esm/hooks:864:22)
    at async nextLoad (node:internal/modules/esm/hooks:864:22)
    at async Hooks.load (node:internal/modules/esm/hooks:451:20)
    at async MessagePort.handleMessage (node:internal/modules/esm/worker:196:18) {
  code: 'ERR_UNKNOWN_FILE_EXTENSION'
}

I have to add a bridge loader to achieve this: https://github.com/nodejs/node-api-cts/blob/main/tools/loader.js

[marco-ippolito]

Duplicate of #199