feat(audience): auto-collect Epic account ID and detect Epic platform #298

Job	Run time
paths-changed	34s
setup	6s
iOS / IL2CPP / Unity 2021.3.45f2	3m 23s
iOS / IL2CPP / Unity 6000.4.0f1	2m 55s
Android / IL2CPP / Unity 6000.4.0f1	10m 6s
Android / IL2CPP / Unity 2021.3.45f2	4m 1s
StandaloneWindows64 / IL2CPP / Unity 2021.3.45f2	3m 53s
StandaloneLinux64 / Mono2x / Unity 2021.3.45f2	3m 19s
StandaloneWindows64 / Mono2x / Unity 6000.4.0f1	2m 19s
StandaloneWindows64 / Mono2x / Unity 2021.3.45f2	45m 20s
StandaloneLinux64 / IL2CPP / Unity 2021.3.45f2	3m 39s
StandaloneOSX / Mono2x / Unity 2021.3.45f2	1h 6m 1s
StandaloneOSX / IL2CPP / Unity 6000.4.0f1	20m 55s
StandaloneOSX / Mono2x / Unity 6000.4.0f1	45m 22s
StandaloneOSX / IL2CPP / Unity 2021.3.45f2	1h 6m 1s
StandaloneWindows64 / IL2CPP / Unity 6000.4.0f1	4m 17s
ci-gate	4s
	4h 42m 15s

Provide feedback