Create a CI for running unit test when creating a PR

[tuanchauict]

This is still in the early stage of the project, and APIs are changed frequently. Therefore, when creating a new class, we usually also need to change some APIs on the current existing APIs.
Personally, I focus on new APIs but not running test old APIs while developing (bad habit), therefore, we need to create a CI to detect broken APIs due to the change.

[tuanchauict]

https://docs.github.com/en/actions