feat(appstash): add multi-target context support #517

Job	Run time
build	1m 3s
test (komoji)	15s
test (jsonld-tools)	22s
test (appstash)	17s
test (clean-ansi)	18s
test (schema-typescript)	21s
test (schema-sdk)	30s
test (find-and-require-package-json)	15s
test (nested-obj)	17s
test (fetch-api-client)	21s
test (inquirerer)	29s
test (yanse)	17s
test (http-errors)	17s
test (genomic)	22s
test (strfy-js)	21s
test (create-gen-app-test)	21s
test (node-api-client)	16s
test (inquirerer-utils)	17s
	6m 39s

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