Ubuntu Linux demos

## 🚀 Feature

Requesting for Ubuntu Linux demos

## Motivation & Examples

- Many Visual SLAM algorithm developers build on Ubuntu Linux OS. Considering Ocean supports all OS except Ubuntu Linux, we might as well support Ubuntu Linux OS to make the library available to more users.

- Considering there are already demos for other OS, only thing we need to do is port existing demos into Ubuntu Linux, with appropriate replacement of thirdparty libraries and build systems if required. (e.g. XCode -> simple CMake project).

## Would you be able/willing to contribute to this work?

Yes. I am planning to replicate Meta Quest headset tracking algorithm with Ocean as a personal project. I might be able to contribute to SLAM demo, as well as porting demos into Ubuntu Linux OS.

Start by reviewing the existing demos for supported operating systems and their XCode or other build configurations. Identify the demos and third-party libraries that need Ubuntu replacements, then verify that the ported demos build and run on Ubuntu Linux.

Written by the indexing model from the issue text.