Ensure hatch is installed before running tests

[cybernobie]

This update adds a prerequisite check to ensure that the hatch tool is installed before running tests.
Without it, the test commands won't execute as expected.

Key Changes:

• Added instructions to install hatch in the Running Tests section of the documentation.

[Viddesh1]

I have a question why not put hatch in pyproject.toml file as dependencies? It can be directly install from source when needed like pip install -e .