Add appearance/multi-page selection feature for v3.1-preview.2 (#10267)

* origin

* add appearance

* add CustomPage feature

* revise feature name

* update pages

* change version to v3.1-preview.2

* format

* solve check

* format

* update readme

* update readme

* update basepath

* update readme

* solve LintDiff issue

* quotes change

* solve comment

* solve comment

* solve comment

* solve comment

* revert default tag

Co-authored-by: Jiayuan Shi <[email protected]>

Author: shijiayuan