Add pydantic validation multidimensional MMM init

[williambdean]

This can use the validate_call like with the other class

pymc-marketing/pymc_marketing/mmm/multidimensional.py

Lines 97 to 112 in 4491b52

	def __init__(
	self,
	date_column: str,
	channel_columns: list[str],
	target_column: str,
	adstock: AdstockTransformation,
	saturation: SaturationTransformation,
	time_varying_intercept: bool = False,
	time_varying_media: bool = False,
	dims: tuple | None = None,
	model_config: dict | None = None, # Ensure model_config is a dictionary
	sampler_config: dict | None = None,
	control_columns: list[str] | None = None,
	yearly_seasonality: int | None = None,
	adstock_first: bool = True,
	) -> None:

[IlanDanial]

Let me know if there is anything more I need to do to contribute

[IlanDanial]

Hello guys I made a pull request that should be viable as it adressed all the issues I got from the prior pull request, please let me know if there are any changes needed