Add images to comments editor

[JorECardenas]

Add a way to add images in the comments editor by pasting or dragging, still needs work

Fix #10559

Mandatory checks

• I own the copyright of the code submitted and I licence it under the MIT license
• Change in CHANGELOG.md described in a way that is understandable for the average user (if change is visible to the user)
• Tests created for changes (if applicable)
• Manually tested changed features in running JabRef (always required)
• Screenshots added in PR description (for UI changes)
• Checked developer's documentation: Is the information available and up to date? If not, I outlined it in this pull request.
• Checked documentation: Is the information available and up to date? If not, I created an issue at https://github.com/JabRef/user-documentation/issues or, even better, I submitted a pull request to the documentation repository.

[HoussemNasri]

Please use a better name for the pull request title. Also, change this line Related to issue 10559 to Fix #10559 so that the pull request is linked to the issue and closed automatically once the PR is merged.

[Siedlerchr]

Looks already cool! Are you planning to continue working on this?