localIdentifier capability should be supported with the local capability

[bicarbon8]

since the BrowserStack Local capability is supported in the connection_settings configuration, you should also provide the ability to set a value for localIdentifier as this would be more in line with how the Cypress tests would need to be used if they're part of a CICD pipeline that runs multiple builds in parallel.
Example implementation should look like the following:

{
   "connection_settings": {
      "local": true,
      "localIdentifier": "build_name+build_number"
    }
}

this would then allow for adding a reference to the browserstack-local npm package which could be started using the same localIdentifier and accessKey as are used for the Cypress tests