On Stable before IME breaking change - [SuperEditor] - Update ime integration to work with custom selection types, and add AttachmentListNode as proof of concept#3020

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stable_before-ime-breaking-change_3106_generalize-ime-and-create-attachment-listFlutter-Bounty-Hunters/super_editor:stable_before-ime-breaking-change_3106_generalize-ime-and-create-attachment-listCopy head branch name to clipboard