v3.3.0

Added
^^^^^

• Create STAIRS_TERRAINS_CFG and STAIRS_TERRAINS_PLAY_CFG terrain configurations
• Create pen_flat_orientation penalization term for QuadrupedEnvCfg
• Create Go2BlindStairsEnvCfg, AnymalDBlindStairsEnvCfg and SpotBlindStairsEnvCfg environment configurations
• Create tasks for Stairs terrains for Go2, AnymalD and Spot robots
• Add pre-trained models for go2_blind_stairs, anymal_d_blind_stairs and spot_blind_stairs experiments
• Add --checkpoint_path argument to rsl_rl train script

Changed
^^^^^

• Create Go2BaseEnvCfg, AnymalDBaseEnvCfg and SpotBaseEnvCfg environment base classes