Add pasting feature when need to upload file in base64 file converter

[liudonghua123]

What type of request is this?

New feature for an existing tool

Clear and concise description of the feature you are proposing

Hi, I always need to convert some network image to base64, so I used base64 file converter tool a lot. But I have to download the image into somewhere in the disk and then select to upload it for converting. I would copy the image then paste onto the card for converting, it would be saving a lot of time and convenient.

Is their example of this tool in the wild?

N.A.

Additional context

I added this feature in this pr.

Validations

• Check the feature is not already implemented in the project.
• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.
• Check that the feature can be implemented in a client side only app (IT-Tools is client side only, no server).