Get benchmark results from `scbench` object in a tidy format, without performance metrics

Usage

results_tidy(scbench, methods = NULL, level = NULL, type = "population")

scbench: an `scbench` object already processed by `deconvolute` or `deconvolute_all`
methods: NULL, a string, or vector of strings. Results will be returned for the methods indicated. See `deconvolution_methods()` for methods.
type: type of deconvoluted mixtures. One of: `"population"`, `"spillover"` or `"lod"`
a: `tibble` with results.