Env (dizoo)

1. apple key to door treasure env (#128)
2. bsuite memory benchmark (#138)
3. polish atari impala config

Algorithm

1. Guided Cost IRL algorithm (#57)
2. ICM exploration algorithm (#41)
3. MP-DQN hybrid action space algorithm (#131)
4. add loss statistics and polish r2d3 pong config (#126)

Enhancement

1. add renew env mechanism in env manager and update timeout mechanism (#127) (#134)

Fix

1. async subprocess env manager reset bug (#137)
2. keepdims name bug in model wrapper
3. on-policy ppo value norm bug
4. GAE and RND unittest bug
5. hidden state wrapper h tensor compatibility
6. naive buffer auto config create bug

Style

1. add supporters list

New Repo Feature

1. treevalue speed benchmark

Contributors: @PaParaZz1 @puyuan1996 @RobinC94 @LikeJulia @Will-Nie @Weiyuhong-1998 @timothijoe @davide97l @lichuminglcm @YinminZhang