Add support for drag'n'drop and paste to ImageInput

[connor-baer]

Purpose

It's a common feature for custom file inputs to support drag'n'drop. Pasting files is less common, but very helpful for keyboard users.

Approach and changes

• Add support for drag'n'drop to the ImageInput
• Add support for paste to the ImageInput
• Handle asynchronous onClear prop on the ImageInput

Definition of done

• Development completed
• Reviewers assigned
• Unit and integration tests
• Meets minimum browser support
• Meets accessibility requirements

[changeset-bot]

🦋 Changeset detected

Latest commit: 9b3da08

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@sumup/circuit-ui	Minor

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[vercel]

This pull request is being automatically deployed with Vercel (learn more).
To see the status of your deployment, click below or on the icon next to each commit.

🔍 Inspect: https://vercel.com/sumup/oss-circuit-ui/F5mmT3UBNn7wTpe3WMfDcZxS3TUY
✅ Preview: https://oss-circuit-ui-git-bugfix-imageinput-clear-promise-sumup.vercel.app

[codecov]

Codecov Report

Merging #1053 (9b3da08) into main (f202a67) will decrease coverage by 0.23%.
The diff coverage is 76.92%.

@@            Coverage Diff             @@
##             main    #1053      +/-   ##
==========================================
- Coverage   92.00%   91.76%   -0.24%     
==========================================
  Files         163      163              
  Lines        3013     3037      +24     
  Branches      782      789       +7     
==========================================
+ Hits         2772     2787      +15     
- Misses        212      221       +9     
  Partials       29       29              

Impacted Files	Coverage Δ
...es/circuit-ui/components/ImageInput/ImageInput.tsx	88.29% <75.00%> (-8.53%)	⬇️
packages/circuit-ui/util/test-utils.tsx	100.00% <100.00%> (ø)

[robinmetral]

🐉&💧