Unable to debug with SAM local invoke in Node.js example

Hi all,
in `nodejs-example-extension` example for Node.js platform something during registration phase brakes the debugger when runs locally on VS Code using `sam local invoke --port 6767 ...` on a Lambda that includes this layer.
The following is a snap of the debug logs when launched from VS Code:
```
START RequestId: 05da599b-f76d-494e-905b-bead9860f186 Version: $LATEST
nodejs-example-extension launching extension
Debugger listening on ws://0.0.0.0:6767/95282789-af6d-4c40-b544-b1d70e0650c2
For help, see: https://nodejs.org/en/docs/inspector
Debugger attached.
hello from extension
register
extensionId 0e16eae5-5e84-4b22-a204-c54424793f69
next
Starting inspector on 0.0.0.0:6767 failed: address already in use
invoke
next
...
```
notice the **Starting inspector on 0.0.0.0:6767 failed: address already in use** error line in logs, after that all set breakpoints are ignored and it's impossible to debug every Lambdas.

this is the VS Code debug task setup:
```
{
"name": "lambda_with_example_layer",
"type": "pwa-node",
"request": "attach",
"address": "localhost",
"port": 6767,
"localRoot": "${workspaceFolder}/lambda_with_example_layer",
"sourceMaps": true,
"remoteRoot": "/var/task",
"protocol": "inspector",
"stopOnEntry": false,
"skipFiles": [
"/**"
]
}
```

Is there any debugger/SAM/Docker configuration that i missed? Or is something else deeper in the layer execution flows that broke debugging in a container with SAM local?

Start with the `nodejs-example-extension` example and reproduce the VS Code attach configuration using `sam local invoke --port 6767`. Read the registration-phase logs around `register`, `next`, and the inspector startup, then determine why the inspector reports port 6767 as already in use. Done means local invocations attach successfully and breakpoints are honored for the Lambda.

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