Add MediaUploadService for uploading files to Media Library

[crazytonyli]

Description

The MediaUploadService is pretty much a simplified version of MediaCoordinator &co. It only works with the WP core REST API. It will be used in a dedicated uploading screen in future PRs.

Testing instructions

[sonarqubecloud]

Quality Gate passed

Issues
3 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[wpmobilebot]

📲 You can test the changes from this Pull Request in WordPress by scanning the QR code below to install the corresponding build.

	App Name	WordPress
	Configuration	Release-Alpha
	Build Number	28123
	Version	PR #24655
	Bundle ID	org.wordpress.alpha
	Commit	59ac2f9
	Installation URL	3tfu076ljiaa8

Automatticians: You can use our internal self-serve MC tool to give yourself access to those builds if needed.

[wpmobilebot]

📲 You can test the changes from this Pull Request in Jetpack by scanning the QR code below to install the corresponding build.

	App Name	Jetpack
	Configuration	Release-Alpha
	Build Number	28123
	Version	PR #24655
	Bundle ID	com.jetpack.alpha
	Commit	59ac2f9
	Installation URL	5f2ae02jb757o

Automatticians: You can use our internal self-serve MC tool to give yourself access to those builds if needed.