Rename class agent_selector -> AgentSelector #1068

Job	Run time
tutorial-test (3.8, Tianshou)	3m 32s
tutorial-test (3.8, CustomEnvironment)	33s
tutorial-test (3.8, CleanRL)	5m 27s
tutorial-test (3.8, SB3/kaz)	9m 16s
tutorial-test (3.8, SB3/waterworld)	8m 38s
tutorial-test (3.8, SB3/connect_four)	7m 25s
tutorial-test (3.8, SB3/test)	2m 13s
tutorial-test (3.8, AgileRL)	15m 4s
tutorial-test (3.9, Tianshou)	8m 48s
tutorial-test (3.9, CustomEnvironment)	36s
tutorial-test (3.9, CleanRL)	6m 7s
tutorial-test (3.9, SB3/kaz)	4m 56s
tutorial-test (3.9, SB3/waterworld)	8m 33s
tutorial-test (3.9, SB3/connect_four)	3m 1s
tutorial-test (3.9, SB3/test)	2m 21s
tutorial-test (3.9, AgileRL)	14m 52s
tutorial-test (3.10, Tianshou)	11m 49s
tutorial-test (3.10, CustomEnvironment)	36s
tutorial-test (3.10, CleanRL)	7m 24s
tutorial-test (3.10, SB3/kaz)	20m 54s
tutorial-test (3.10, SB3/waterworld)	8m 29s
tutorial-test (3.10, SB3/connect_four)	14m 50s
tutorial-test (3.10, SB3/test)	13m 0s
tutorial-test (3.10, AgileRL)	16m 21s
tutorial-test (3.11, Tianshou)	3m 28s
tutorial-test (3.11, CustomEnvironment)	29s
tutorial-test (3.11, CleanRL)	7m 20s
tutorial-test (3.11, SB3/kaz)	4m 30s
tutorial-test (3.11, SB3/waterworld)	8m 10s
tutorial-test (3.11, SB3/connect_four)	2m 51s
tutorial-test (3.11, SB3/test)	2m 46s
tutorial-test (3.11, AgileRL)	29m 26s
	4h 13m 45s

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