FEATURE: Added EmojiPreview component for typing Emojis using : shortcut

[Kamlesh72]

Description

Added a Component called EmojiPreview that provides shortcuts to type Emojis. Easily Access Emojis using ":"

Fixes #105

Video/Screenshots

https://github.com/RocketChat/EmbeddedChat/assets/90441742/82b8473c-3366-45ca-87e1-5ff0becc9867

[Kamlesh72]

Things yet to be added: Pressing Enter should select the current emoji. Also pressing ArrowUp shouldn't move the cursor to the start of text.

[abhinavkrin]

Thank you @Kamlesh72 for the incredible work! Your contributions are paving the way for us to develop a custom emoji picker. This is particularly beneficial since our current emoji picker package is quite large, adding about 1MB to our bundle size. With the emoji set from your PR, we can design a more efficient and tailored emoji picker that better suits our needs. Your efforts are greatly appreciated!