57 gymnasium env

[ArzhelaR]

Closes #57

Add two gymnasium environments :

• Trimesh-v0 : a triangular meshing environment with 3 available actions (flip, split collapse)
• TrimeshFlip-v0 : a triangular meshing environment with only one action, flip.

Create callbacks to register different variables to monitor the learning of the agents and then plot them in tensorboard.

Perform studies on these environments, saving the results in different directories (tune/results).

[codacy-production]

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Coverage variation	Diff coverage
✅ -0.95% (target: -1.00%)	✅ 80.17%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (620e9df)	1015	895	88.18%
Head commit (d548165)	1088 (+73)	949 (+54)	87.22% (-0.95%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#58)	121	97	80.17%

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