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**Description**

DatabricksRunNowOperator is missing the option to take in key word arguement _jar_params_ , it already can take the other ones notebook_params,python_params,spark_submit_params. https://docs.databricks.com/dev-tools/api/latest/jobs.html#run-now


**Use case / motivation**

Provide parity with the other options

airflow/providers/databricks/operators/databricks.py
https://docs.databricks.com/api/latest/jobs.html#run-now
    :type json: dict
    :param notebook_params: A dict from keys to values for jobs with notebook task,
        e.g. "notebook_params": {"name": "john doe", "age":  "35"}.
        The map is passed to the notebook and will be accessible through the
        dbutils.widgets.get function. See Widgets for more information.
        If not specified upon run-now, the triggered run will use the
        job’s base parameters. notebook_params cannot be
        specified in conjunction with jar_params. The json representation
        of this field (i.e. {"notebook_params":{"name":"john doe","age":"35"}})
        cannot exceed 10,000 bytes.
        This field will be templated.
        .. seealso::
            https://docs.databricks.com/user-guide/notebooks/widgets.html
    :type notebook_params: dict
    :param python_params: A list of parameters for jobs with python tasks,
        e.g. "python_params": ["john doe", "35"].
        The parameters will be passed to python file as command line parameters.
        If specified upon run-now, it would overwrite the parameters specified in
        job setting.
        The json representation of this field (i.e. {"python_params":["john doe","35"]})
        cannot exceed 10,000 bytes.
        This field will be templated.
        .. seealso::
            https://docs.databricks.com/api/latest/jobs.html#run-now
    :type python_params: list[str]
    :param spark_submit_params: A list of parameters for jobs with spark submit task,
        e.g. "spark_submit_params": ["--class", "org.apache.spark.examples.SparkPi"].
        The parameters will be passed to spark-submit script as command line parameters.
        If specified upon run-now, it would overwrite the parameters specified