Disable taps during async animations

[thedalelakes]

Description

Currently, if a tutorial is in the foreground, and the user taps something, an animation occurs. This animation does not reject additional taps while the animation is in progress.

This PR prevents spurious taps from being registered while there is an active animation.

Checklist

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• [x] I open this PR to the develop branch.
• [x] I have added a description of the change under [next] in CHANGELOG.md.
• [x] I ran flutter format --set-exit-if-changed --dry-run . and has success.

Breaking Change

Does your PR require Flame users to manually update their apps to accommodate your change?

• [ ] Yes, this is a breaking change (please indicate a breaking change in CHANGELOG.md).
• [x] No, this is not a breaking change.