Update to gymnasium (#82)

* update install_requires

* §

* fix imports: gym → gymnasium

* fix step function

* fix step

* gym->gymnasium

* §

* fix

* fix

* fix

* fix

* fix

* fix render

* .

* fix all step returns

* Delete build/lib/carl directory

* Delete myenv directory

* Update README.md

Fix documentation link.

* make pre-commit and format

* rename every occurrence of trunched to truncated

* @Arman717

* change trunched to truncated

* Fix gymnasium version with box2d

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Co-authored-by: C. Benjamins <75323339+benjamc@users.noreply.github.com>

carl/envs/rna/carl_rna_definitions.py

@@ -1,5 +1,5 @@
 import numpy as np
-from gym import spaces
+from gymnasium import spaces
 
 DEFAULT_CONTEXT = {
     "mutation_threshold": 5,