Added : customize the color and background color of selected text (#1601)

* Added Emoji Support

* Added Color Picker for font color and background color

* chore: revert code

* feat: re-implement the color picker

* test: add test case for adding color

* test: update appflowy_editor test flag

Co-authored-by: Muhammad Rizwan <haris.arshad.2010@gmail.com>
Co-authored-by: Lucas.Xu <lucas.xu@appflowy.io>

frontend/app_flowy/packages/appflowy_editor/assets/images/checkmark.svg

@@ -0,0 +1,3 @@
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+<path d="M1 5.2L2.84615 7L9 1" stroke="#00BCF0" stroke-linecap="round" stroke-linejoin="round"/>
+</svg>