Check for binning approach from configuration or normalized file.

def bin_approach(data):
    """Check for binning approach from configuration or normalized file.
    """
    for approach in ["cnvkit", "gatk-cnv"]:
        if approach in dd.get_svcaller(data):
            return approach
    norm_file = tz.get_in(["depth", "bins", "normalized"], data)
    if norm_file.endswith(("-crstandardized.tsv", "-crdenoised.tsv")):
        return "gatk-cnv"
    if norm_file.endswith(".cnr"):
        return "cnvkit"