Refactor literal class name to constants

[ghost]

• [x] Button (#838)

• [x] Card (#839)

• [x] Checkbox (#982)

• [x] Chips (#982)

• [x] Drawer (#982)

• [x] Fab (#844)

• [x] FloatingLabel (#845)

• [x] IconButton (#982)

• [x] LayoutGrid (#846)

• [x] LineRipple (#983)

• [x] LinearProgress (#983)

• [x] List (#983)

• [x] MaterialIcon (#983)

• [x] Menu (#983)

• [x] MenuSurface (#983)

• [ ] NotchedOutline

• [x] Radio (#983)

• [x] Select (#983)

• [x] SnackBar (#983)

• [x] Switch

• [x] TabBar

• [x] TabIndicator

• [x] TabScroller

• [x] Tab

• [x] Text Filed

• [x] TopAppBar

[abhiomkar]

I created feat/constants branch on upstream for future PRs so we can merge to master branch at once. Thanks!

[ghost]

@abhiomkar That's nice. Thank you!