feat: data_path argument in construction of BenchmarkSet allows for overriding local config data path

[sumny]

E.g.

from yahpo_gym import benchmark_set
import yahpo_gym.benchmarks.lcbench

bench = benchmark_set.BenchmarkSet("lcbench", data_path = tmp_dir)

where tmp_dir is a temporary directory similar in structure as the usual yahpo_data data directory

[sumny]

merged into v2_final with https://github.com/slds-lmu/yahpo_gym/commit/b211de418463be410b25d16d8fbce1d323231a6d