[Generation] Add data patch and observer generators

[AboElnoor]

Is your feature request related to a problem? Please describe.
No, related issue: #861

A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
Creating data patches manually

Describe the solution you'd like (*)

A clear and concise description of what you want to happen.
To add the ability to add data patch singularly when I click on setup directory for example

[m2-assistant]

Hi @AboElnoor. Thank you for your report.
To speed up processing of this issue, make sure that you provided sufficient information.

Add a comment to assign the issue: @magento I am working on this

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[AboElnoor]

Hi @bohdan-harniuk ,
Creating observers is also missing individually. I believe it needs to show up too.
Regards

[bohdan-harniuk]

Hello, @AboElnoor!

Thank you for the great ideas!
We'll definitely add those generators in the near time.

Regards,

[anzin]

@magento I am working on this