env, ci: add support for linux emulator runs, add new `emulator` module #555

Job	Run time
build-legacy-v-examples-as-apk-and-aab (ubuntu-20.04, 8, 31)	6m 7s
build-v-examples-as-apk-and-aab (ubuntu-20.04, 11, 31)	5m 18s
build-legacy-v-examples-as-apk-and-aab (ubuntu-20.04, 8, 33)	6m 12s
build-v-examples-as-apk-and-aab (ubuntu-20.04, 11, 33)	6m 6s
build-v-examples-with-gc-disabled (ubuntu-20.04, 11, 31)	3m 46s
build-v-examples-as-apk-and-aab (ubuntu-20.04, 15, 31)	5m 30s
build-v-examples-with-gc-disabled (ubuntu-20.04, 11, 33)	3m 51s
build-v-examples-as-apk-and-aab (ubuntu-20.04, 15, 33)	5m 9s
build-v-examples-with-gc-disabled (ubuntu-20.04, 15, 31)	3m 47s
build-v-examples-as-apk-and-aab (ubuntu-20.04, 20, 31)	4m 56s
build-v-examples-with-gc-disabled (ubuntu-20.04, 15, 33)	3m 46s
build-v-examples-as-apk-and-aab (ubuntu-20.04, 20, 33)	5m 3s
build-v-examples-with-gc-disabled (ubuntu-20.04, 20, 31)	3m 59s
build-v-examples-with-gc-disabled (ubuntu-20.04, 20, 33)	3m 55s
	1h 7m 25s

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