Draft: Add ProjectData Python wrapper for Parameter access

This MR allows for accessing parameters in project files from Python.

Had some issues after a rebase, I guess !4521 (merged) breaks it. I get the following error when I load the module:

In [1]: import api as ogsapi
terminate called after throwing an instance of 'std::runtime_error'
  what():  Can't add new modules after the interpreter has been initialized
[1]    145977 IOT instruction (core dumped)  ipython3

Perhaps you could take a look. Thx!

1. Feature description was added to the changelog
2. Tests covering your feature were added?
3. Any new feature or behavior change was documented?