Cache debbuging

To make the process of configuration and debugging more comfortable, we provide several useful ENV variables.

Variable	Purpose
GEKO_CONFIG_STATS_OUTPUT	Saves geko command logs to the .geko folder in the project root.
GEKO_CONFIG_CACHE_TARGET_HASHES_SAVE	During cache warmup, it saves logs for each module
GEKO_CONFIG_LOG_STORAGE_DIR	Allows you to specify a custom folder for build, hash, and analytics logs. If not specified, it saves to the geko folder in the project root.