feat: Add possibility for solid hitboxes

[spydon]

Description

Currently all hitboxes are hollow, this PR adds the possibility for solid hitboxes. When a hitbox is fully enclosed by a solid hitbox the inner hitbox's position will be returned as the intersection point.

Checklist

• [x] The title of my PR starts with a Conventional Commit prefix (fix:, feat:, docs: etc).
• [x] I have read the Contributor Guide and followed the process outlined for submitting PRs.
• [x] I have updated/added tests for ALL new/updated/fixed functionality.
• [x] I have updated/added relevant documentation in docs and added dartdoc comments with ///.
• [x] I have updated/added relevant examples in examples.

Breaking Change

• [x] No, this is not a breaking change.

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