Add numba and yaml to dependencies in setup.py

[jwoillez]

Contrary to what is stated in the documentation (https://soapy.readthedocs.io/en/latest/install.html#required), yaml and numba are not set as required dependencies in setup.py. I can add then with a PR if you give me the minimum version to use.

FYI latest versions:

• https://github.com/yaml/pyyaml v5.3.1
• https://github.com/numba/numba v0.49.0