ENH: Add Bildungs- und Teilhabepaket

[MImmesberger]

Is your feature request related to a problem?

Currently, we do not model the Bildungs- und Teilhabepaket. The transfer is supposed to cover expenses for school and extracurricular activity. While school expenses are paid upon application, there is a lump sum transfer for extracurricular activity (Teilhabe).

Describe the solution you would like to see

In the policy project, we used the following function:

def bildung_und_teilhabe_only_teilhabe_pauschale_m(
    arbeitsl_geld_2_m_bg: float,
    wohngeld_m_wthh: float,
    kinderzuschl_m_bg: float,
    kindergeld_anspruch: bool,
    alter: float,
    in_ausbildung: bool,
) -> float:
    """Calculate monthly allowance for education and participation.

    This is a fixed amount of money that is paid to all children recieving any
    means-tested transfer.

    Returns only the Teilhabepaket, not the Schulbedarf.

    Returns
    -------

    """
    any_transfer = (
        (arbeitsl_geld_2_m_bg > 0) or (wohngeld_m_wthh > 0) or (kinderzuschl_m_bg > 0)
    )

    # Teilhabepaket
    if any_transfer and kindergeld_anspruch and (alter < 18):
        out = 15.0
    else:
        out = 0.0

    return out