Implement the custom style flow part 1

 - Make the options horizontal scrolls, note that the picker side UI
 will be vertical scroll(like Style and Grid tab)
 - Adjust custom style flow pages layout, will have next cl to fine-tune
 the recyclerview and options
 Doc: https://docs.google.com/presentation/d/15JadcGi5k1_0znUN_XdFpU7UxeXwxjK3Y7LxvhW5ETM/edit#slide=id.g85fff7c452_6_15
 Video: https://drive.google.com/file/d/1x2oc6p2TOUpO3JUSr3tkrF3fZ61PBZ-v/view?usp=sharing

 Bug: 151285666
 Test: manually

Change-Id: If0cbb5afa1d5e005805a8459467cda89609fd97a