update(userspace): define subtable field type in plugin API and sinsp state API #721

Job	Run time
build-test-e2e-amd64 😇 (bundled_deps)	19m 35s
build-test-e2e-arm64 😇 (bundled_deps)	28m 29s
test-e2e-amd64-kmod 😇 (bundled_deps)	4m 5s
test-e2e-amd64-bpf 😇 (bundled_deps)	3m 29s
test-e2e-amd64-modern-bpf 😇 (bundled_deps)	3m 52s
test-e2e-arm64-kmod 😇 (bundled_deps)	5m 56s
test-e2e-arm64-bpf 😇 (bundled_deps)	7m 27s
test-e2e-arm64-modern-bpf 😇 (bundled_deps)	5m 35s
	1h 18m 28s

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