Add operations & facts for opkg (OpenWrt's package manager) (#1053) #1594

Job	Run time
type-check	24s
lint	23s
spell-check	7s
end-to-end-test (ubuntu-20.04, local)	24s
unit-test (ubuntu-20.04, 3.8)	38s
end-to-end-test (ubuntu-20.04, ssh)	1m 23s
unit-test (ubuntu-20.04, 3.9)	42s
end-to-end-test (ubuntu-20.04, docker)	27s
unit-test (ubuntu-20.04, 3.10)	34s
end-to-end-test (ubuntu-latest, local)	28s
unit-test (ubuntu-20.04, 3.11)	32s
end-to-end-test (ubuntu-latest, ssh)	1m 20s
unit-test (ubuntu-20.04, 3.12)	45s
end-to-end-test (ubuntu-latest, docker)	28s
unit-test (ubuntu-latest, 3.8)	44s
end-to-end-test (macos-latest, local)	20s
unit-test (ubuntu-latest, 3.9)	33s
unit-test (ubuntu-latest, 3.10)	39s
unit-test (ubuntu-latest, 3.11)	30s
unit-test (ubuntu-latest, 3.12)	41s
unit-test (macos-13, 3.11)	1m 4s
unit-test (windows-2022, 3.11)	1m 27s
tests-done	2s
	14m 35s

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