Reads the global dqcheckr.yml and the dataset-specific YAML, merging
rule_overrides from the dataset config on top of default_rules
from the global config.
Examples
cfg_dir <- system.file("demonstrations/config", package = "dqcheckr")
cfg <- load_config("starwars_csv", config_dir = cfg_dir)
cfg$format
#> [1] "csv"