feat(Slider): new component (#57)

Co-authored-by: Benjamin Canac <canacb1@gmail.com>

src/theme/index.ts

@@ -22,6 +22,7 @@ export { default as radioGroup } from './radio-group'
 export { default as separator } from './separator'
 export { default as skeleton } from './skeleton'
 export { default as slideover } from './slideover'
+export { default as slider } from './slider'
 export { default as switch } from './switch'
 export { default as tabs } from './tabs'
 export { default as textarea } from './textarea'