PoC: Implement optional host proxy for lima cache #5984

Job	Run time
Colima (v0.6.5)	7m 28s
Integration tests (on Linux) (alpine.yaml)	7m 28s
Integration tests	25m 58s
Integration tests (on Linux) (debian.yaml)	9m 57s
Lints	3m 38s
Integration tests (on Linux) (fedora.yaml)	8m 24s
Spell check	12s
Unit tests (1.22.x)	6m 11s
Integration tests (on Linux) (opensuse.yaml)	7m 52s
Unit tests (1.23.x)	5m 56s
Integration tests (on Linux) (docker.yaml)	8m 40s
Upgrade test (v0.15.1)	15m 58s
VMNet test	20m 13s
Integration tests (on Linux) (../hack/test-templates/alpine-iso-9p-writable.yaml)	6m 48s
Windows tests	7m 16s
vz (default.yaml)	14m 31s
Integration tests (on Linux) (../hack/test-templates/net-user-v2.yaml)	8m 29s
vz (fedora.yaml)	13m 35s
Integration tests (on Linux) (../hack/test-templates/test-misc.yaml)	37m 8s
	3h 35m 42s

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