[FEAT]: Get the current github_app from a data source similar to github_user

[dreinhardt89]

Describe the need

You can currently get the current github_user via a data source like below:

# Retrieve information about the currently authenticated user.
data "github_user" "current" {
  username = ""
}

it would be nice to be able to do the same with the github_app data source (for when you are authenticating the provider with a github app).

ex:

# Retrieve information about the currently authenticated app.
data "github_app" "current" {
  slug = ""
}

SDK Version

No response

API Version

No response

Relevant log output

No response

Code of Conduct

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