[Environment] Complete `PettingZooWrapper` state support (#2953)

Co-authored-by: Vincent Moens <vmoens@meta.com>
(cherry picked from commit d882ea2)

[CI] Build wheels on osx 15

ghstack-source-id: 9b3ebb7
Pull-Request-resolved: #2934

Versioning

[Doc] Fix formatting errors

ghstack-source-id: ac1f3da
Pull Request resolved: #2786

(cherry picked from commit 03d6586)

init

empty-commit

empty

[Doc] Fix links in doc (#2151)

(cherry picked from commit 5b9cb44)

[BugFix] Fix broken gym tests (#1980)

torchrl v0.3.0