Reads schema.yml, mappings.yml, and (optionally) validation.yml,
provenance.json, and ATTRIBUTION.md from a profile directory.
Examples
p <- load_profile(system.file("extdata", "profiles", "asap", package = "krt"))
p$columns
#> [1] "RESOURCE TYPE" "RESOURCE NAME" "SOURCE"
#> [4] "IDENTIFIER" "NEW/REUSE" "ADDITIONAL INFORMATION"
