feat: text and background color in mobile toolbar (#233)

* refactor: move shared code out of desktop

* refactor: fix double exist error and extract color option

* feat: update color icon

* refactor: refactor MobileToolbarItemMenuBtn to be more flexiable

* feat: add textAndBackgroundColorMobileToolbarItem

* chore: dart fix

* refactor: extract MobileToolbarMenuGridDelegate

* chore: update UI parameters

* refactor: delete format color in format_rich_text_style.dart and refactor the code

* chore: remove the bottom line of tabbar

* refactor: set color opitions to be customizable

* chore: add scrollbar in opitions grid view

* test: update code to pass the previous tests

* chore: add Material in testing

* chore: unify text and background default color opitions

* test: add textAndBackgroundColorMobileToolbarItem test

* chore: update AppFlowyEditorLocalizations

* chore: replace string by components' key in tests

* test: add color options widgets tests

* chore: dart fix

* chore: dart format

lib/l10n/intl_en.arb

@@ -2,7 +2,7 @@
   "@@locale": "en",
   "bold": "Bold",
   "@bold": {},
-  "bulletedList": "Bulleted list",
+  "bulletedList": "Bulleted List",
   "@bulletedList": {},
   "checkbox": "Checkbox",
   "@checkbox": {},
@@ -24,7 +24,7 @@
   "@italic": {},
   "link": "Link",
   "@link": {},
-  "numberedList": "Numbered list",
+  "numberedList": "Numbered List",
   "@numberedList": {},
   "quote": "Quote",
   "@quote": {},
@@ -74,6 +74,7 @@
   "@backgroundColorPink": {},
   "backgroundColorRed": "Red background",
   "@backgroundColorRed": {},
+  "done": "Done",
   "tint1": "Tint 1",
   "tint2": "Tint 2",
   "tint3": "Tint 3",
@@ -92,7 +93,11 @@
   "lightLightTint7": "Green",
   "lightLightTint8": "Aqua",
   "lightLightTint9": "Blue",
-  "textColor": "Text color",
+  "mobileHeading1": "Heading 1",
+  "mobileHeading2": "Heading 2",
+  "mobileHeading3": "Heading 3",
+  "textColor": "Text Color",
+  "backgroundColor": "Background Color",
   "addYourLink": "Add your link",
   "openLink": "Open link",
   "copyLink": "Copy link",