Add Queue interface and BrowserQueue implementation #6003

Job	Run time
Check which packages changed	0s
Check which packages changed	0s
Lint	2m 2s
Lint	2m 2s
AI bot Tests	52s
AI bot Tests	52s
Boxel Motion Tests	1m 10s
Boxel Motion Tests	1m 10s
Boxel UI Tests	1m 33s
Boxel UI Tests	1m 33s
Host Tests	11m 7s
Host Tests	11m 39s
Matrix Client Tests - Group 1	12m 44s
Matrix Client Tests - Group 1	12m 44s
Matrix Client Tests - Group 2	11m 45s
Matrix Client Tests - Group 2	11m 45s
Realm Server Tests	5m 19s
Realm Server Tests	5m 19s
deploy-ai-bot	0s
deploy-ai-bot	0s
Deploy boxel to staging	0s
Deploy boxel to staging	0s
	1h 33m 36s

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