[MERGE] mail, *: several UX/UI improvements

*: bus, im_livechat, mail_bot, website_livechat

Several improvements for Discuss app:

1. Improved "is typing..." notification
2. Merged private & public channels
3. Quick channel search
4. No push notification right after accepting them, and transparent odoo bot icon in native notification
5. Selected emojis are inserted in composer based on cursor position
6. Set surname to people for DMs name
7. Discard replying to a message in Inbox
8. Broadcast "seen" notification ('v' and 'vv' on messages)

[1] [image1](https://drive.google.com/file/d/11_H6ZJh0wFaegAV0fTLdc68z37nhVKnW/view?usp=sharing), [image2](https://drive.google.com/file/d/1s9g_hUCMesuTLAqpeGMwLWzHCYnzanr6/view?usp=sharing)
[2] [image1](https://drive.google.com/file/d/1WUBqc2lScfWV8Yrtq6Zk4MO4jC0CdaiG/view?usp=sharing), [image2](https://drive.google.com/file/d/13XVcW0Nookwea_4xz02mIwPi5dPhXu18/view?usp=sharing)
[3] [image1](https://drive.google.com/file/d/1FuV3xH9cK6qR7ljd5vELOHc4icvHIJTF/view?usp=sharing), [image2](https://drive.google.com/file/d/1hwuu5ejlj9ou02NF5XmL-XHTiD-Ty6XT/view?usp=sharing)
[4] [image](https://drive.google.com/file/d/1si1TYtCpdyOgw9IRaMWmxuUb1d8M4ccF/view?usp=sharing)
[5] [video](https://drive.google.com/file/d/19knQ47F1wzlNvxT2nJH3A9V34wO1D9Bn/view?usp=sharing)
[6] [image1](https://drive.google.com/file/d/11ot_DtySN2cIN_bM8n7fhFV2JXNoz0lH/view?usp=sharing), [image2](https://drive.google.com/file/d/1aNyapzKePIRg903woCo3kXJhy-ZFwfEG/view?usp=sharing), [image3](https://drive.google.com/file/d/1AtVlOG67YjsS8ax1ErWhXfSDOtKhLQhC/view?usp=sharing)
[7] [image](https://drive.google.com/file/d/1U-VEut7M7-t9WzdKVagfyy6ZrbOJrflp/view?usp=sharing)
[8] [image1](https://drive.google.com/file/d/1_32q8iqPBhW4sPhAtY5mIO968gj1o9o-/view?usp=sharing), [image2](https://drive.google.com/file/d/1Ne6HMEgJxHAWYN3e3SlrF6Qqg70LDvAW/view?usp=sharing)

Task-ID 1881001

closes odoo/odoo#29191

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