Bruno Leroux b23105276f
Expose barrierDismissible in PageRoute constructor (#133659)
## Description

This PR exposes `barrierDismissible` in `PageRoute`, `MaterialPageRoute` and `CupertinoPageRoute` constructors.
Setting this property to true will enable the escape key binding.

## Related Issue

Fixes https://github.com/flutter/flutter/issues/132138.

## Tests

Adds one test.
2023-08-30 19:02:06 +00:00
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