[Resolve #131] Add button on `author.send()`

[rtk-rnjn]

Fixes #131

Description:

• Add view in Context.author.send() and User.send()
• Run isort followed by black
• [ImgBot] Optimize image

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Checklist:

• [x] I have performed a self-review of my own code.
• [x] I have commented my code, particularly in hard-to-understand areas.