Add barebones Remote object, make _caching private #404

Job	Run time
Setup and Cache Dependencies	1m 44s
Conan (unittests) (3.8)	1m 25s
Conan (integration) (3.8)	2m 50s
Conan (functional) (3.8)	24m 45s
Conan (unittests) (3.12)	1m 1s
Conan (integration) (3.12)	2m 15s
Conan (functional) (3.12)	15m 28s
Conan (unittests) (3.13)	1m 12s
Conan (integration) (3.13)	2m 20s
Conan (functional) (3.13)	18m 56s
	1h 11m 56s

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