[flutter_adaptive_scaffold] Add `transitionDuration` parameter.

[GiftShower]

Adds transitionDuration parameter for specifying how long the animation should be.

This adds the following suggestion from the issue https://github.com/flutter/flutter/issues/114272

The duration of the animations are set to 1 second, we should have the option to set animation durations when creating slot layouts.

Originally posted by @jamiewest in https://github.com/flutter/flutter/issues/114272#issuecomment-1304288452

Pre-launch Checklist

• [x] I read the Contributor Guide and followed the process outlined there for submitting PRs.
• [x] I read the Tree Hygiene wiki page, which explains my responsibilities.
• [x] I read and followed the relevant style guides and ran the auto-formatter. (Unlike the flutter/flutter repo, the flutter/packages repo does use dart format.)
• [x] I signed the CLA.
• [x] The title of the PR starts with the name of the package surrounded by square brackets, e.g. [shared_preferences]
• [x] I listed at least one issue that this PR fixes in the description above.
• [x] I updated pubspec.yaml with an appropriate new version according to the pub versioning philosophy, or this PR is exempt from version changes.
• [x] I updated CHANGELOG.md to add a description of the change, following repository CHANGELOG style.
• [x] I updated/added relevant documentation (doc comments with ///).
• [ ] I added new tests to check the change I am making, or this PR is test-exempt.
• [ ] All existing and new tests are passing.

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[gspencergoog]

Thanks for the PR! This is a good feature to add, but there will have to be a test for the feature before we can accept it.

[GiftShower]

@gspencergoog I have added test. Can you review the conflicting changelog and test?

[GiftShower]

fixed versioning issue

[stuartmorgan]

Are you still planning on updating this PR to address the review comments above?

[GiftShower]

Yes. I am planning to update it. I will update it as soon as possible.

2023년 4월 19일 (수) 오전 4:50, stuartmorgan @.***>님이 작성:

Are you still planning on updating this PR to address the review comments above?

— Reply to this email directly, view it on GitHub https://github.com/flutter/packages/pull/3487#issuecomment-1513712610, or unsubscribe https://github.com/notifications/unsubscribe-auth/AOALRCJKIM65LYCFCAPN4QTXB3V5ZANCNFSM6AAAAAAV77KZAA . You are receiving this because you authored the thread.Message ID: @.***>

[stuartmorgan]

Since this is still failing a lot of CI, I'm going to mark it as a draft; once it's passing tests please feel free to mark it as ready for review!

[stuartmorgan]

Since this is marked as a draft and hasn't been updated in several months I'm going to close it to clean out our review queue. Please don't hesitate to submit a new PR if you decide to revisit this. Thanks!

[KKranjcevic]

This is not a big change for the package, but is a big change for us developers. Please release this update!

[stuartmorgan]

Please release this update!

This PR was never completed, so there is nothing to release. Anyone in the community interested in this feature is welcome to make a new PR to implement it.