Consider Git Repo Separation (Application) After 2023 Release

[myungjoo]

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After the release of 2023, please consider separating git repo for Application. (e.g., nnstreamer-example or.... let's create example or application repo)

Having application codes from other open sources in the main framework repo might become license-wise problematic soon. And, this might lighten the need for topic branches for new applications.