Accept the api token through the `DAPR_API_TOKEN` environment variable

[elena-kolevska]

As described in https://github.com/dapr/proposals/blob/main/0010-S-unified-api-token-env-variable.md

[elena-kolevska]

/assign

[mikeee]

/assign

[mikeee]

Updated proposal url: https://github.com/dapr/proposals/blob/main/20230918-S-unified-api-token-env-variable.md

[github-actions]

🚀 issue assigned to you mikeee