feat(cli): send telemetry events to local file

[kaizencc]

Introduces two telemetry events: invoke and synth:

Invoke: all cli commands send an invoke event. this event gets sent at the conclusion of the command and includes the entire duration of the command.
Synth: some commands synthesize a cloud assembly (cdk synth, cdk deploy, cdk watch, cdk list, cdk diff). these events also send a synth event that includes the duration of the atomic synthesis function that all commands share.

This PR sends telemetry events to a local file. It does not send to an external endpoint yet.

Example: cdk deploy with no credentials (synth event succeeds, invoke event fails)

--

> cdk deploy MyStack --unstable=telemetry --telemetry-file=my/local/file

[
  {
    "event": {
      "command": {
        "path": [
          "deploy",
          "$STACK1"
        ],
        "parameters": {
          "telemetry-file": "<redacted>",
          "unstable": "<redacted>",
          "verbose": 3,
          "lookups": true,
          "ignore-errors": false,
          "json": false,
          "debug": false,
          "staging": true,
          "notices": true,
          "no-color": false,
          "ci": false,
          "all": false,
          "build-exclude": "<redacted>",
          "import-existing-resources": false,
          "force": false,
          "parameters": "<redacted>",
          "previous-parameters": true,
          "logs": true,
          "concurrency": 1,
          "asset-prebuild": true,
          "ignore-no-stacks": false
        },
        "config": {
          "bags": true,
          "fileNames": true
        }
      },
      "state": "SUCCEEDED",
      "eventType": "SYNTH"
    },
    "identifiers": {
      "installationId": "7cb67dad-250e-46fa-a28f-ea365b604b8d",
      "sessionId": "5f1cf087-44dc-4ba5-8f2b-520a7fbe32b4",
      "telemetryVersion": "1.0",
      "cdkCliVersion": "0.0.0",
      "region": "us-east-1",
      "eventId": "5f1cf087-44dc-4ba5-8f2b-520a7fbe32b4:1",
      "timestamp": "2025-07-11T13:16:49.201Z"
    },
    "environment": {
      "ci": false,
      "os": {
        "platform": "darwin",
        "release": "node"
      },
      "nodeVersion": "v20.19.1"
    },
    "project": {},
    "duration": {
      "total": 4350
    }
  },
  {
    "event": {
      "command": {
        "path": [
          "deploy",
          "$STACK1"
        ],
        "parameters": {
          "telemetry-file": "<redacted>",
          "unstable": "<redacted>",
          "verbose": 3,
          "lookups": true,
          "ignore-errors": false,
          "json": false,
          "debug": false,
          "staging": true,
          "notices": true,
          "no-color": false,
          "ci": false,
          "all": false,
          "build-exclude": "<redacted>",
          "import-existing-resources": false,
          "force": false,
          "parameters": "<redacted>",
          "previous-parameters": true,
          "logs": true,
          "concurrency": 1,
          "asset-prebuild": true,
          "ignore-no-stacks": false
        },
        "config": {
          "bags": true,
          "fileNames": true
        }
      },
      "state": "FAILED",
      "eventType": "INVOKE"
    },
    "identifiers": {
      "installationId": "7cb67dad-250e-46fa-a28f-ea365b604b8d",
      "sessionId": "5f1cf087-44dc-4ba5-8f2b-520a7fbe32b4",
      "telemetryVersion": "1.0",
      "cdkCliVersion": "0.0.0",
      "region": "us-east-1",
      "eventId": "5f1cf087-44dc-4ba5-8f2b-520a7fbe32b4:2",
      "timestamp": "2025-07-11T13:16:49.385Z"
    },
    "environment": {
      "ci": false,
      "os": {
        "platform": "darwin",
        "release": "node"
      },
      "nodeVersion": "v20.19.1"
    },
    "project": {},
    "duration": {
      "total": 4609
    },
    "error": {
      "name": "ExpiredToken"
    }
  }
]

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

@mrgrain and i have touched base off line and there are no blockers to launch this feature.