Add esp-nimble-cpp to esp component registry

[tecera]

Espressif has recently(ish) created the component registry (https://components.espressif.com/). This makes it really easy for users of the library to automatically update the library without needing to use git submodules or complicated workflows. The package can be automatically published to the registry using a Github Action as well.

Would you be interested in supporting this?

[h2zero]

@tecera Thank you for opening this issue. I have a plan in place to add this to the registry on the next, hopefully soon, release.