Dashboard: Add tooltips

[proy30]

Replacing #759, resolves #722

The core functionality works by taking a list of class names where the docstrings are located, scanning through each property and method that matches a key in the DEFAULTS dictionary, and then outputting a dictionary with the appropriate tooltip.

For example, in defaults.py we can have something like:

INPUT_PARAMETERS = {
    "charge_qe": -1,
}

When we call:

get_docstrings([RefPart, ImpactX], INPUT_PARAMETERS )

the function iterates through each property and method in the two classes until it finds:

@property
def charge_qe(self) -> float:
    """
    Get reference particle charge (positive elementary charge)
    """

It then appends the extracted docstring to the output dictionary, resulting in something like:

TOOLTIPS = {
    "charge_qe": "Get reference particle charge (positive elementary charge)",
}

Note: The tooltips are not added to the distribution/lattice configuration sections. A separate PR is needed to update defaults.py with the correct defaults to enable tooltips for those sections.

[ax3l]

Awesome, thank you! :)