feat(ar): add MangaCloud source

[hamedhani1998]

Checklist:

• Updated versionCode value in build.gradle.kts
• Updated baseVersionCode in build.gradle.kts (if updated multisrc theme code)
• Referenced all related issues in the PR body (e.g. "Closes #xyz")
• Set the contentWarning configuration in build.gradle.kts appropriately
• Have not changed source names
• Have explicitly kept the id if a source's name or language were changed
• Have tested the modifications by compiling and running the extension through Android Studio
• Have removed web_hi_res_512.png when adding a new extension
• This PR is AI-assisted, I have reviewed the changes manually and confirmed they are not slop

[Smol-Ame]

Marking as a draft

1. Use the source's icon/logo instead of your own AI-generated rendition
2. You have a random ID in your code.

Undraft it when you've looked through your AI slop.

[hamedhani1998]

Marking as a draft

1. Use the source's icon/logo instead of your own AI-generated rendition
2. You have a random ID in your code.

Undraft it when you've looked through your AI slop.

ok

[Smol-Ame]

The random ID is still there.

[hamedhani1998]

@AwkwardPeak7 Hi,

I wanted to follow up on my two pull requests / issues. Are there any remaining issues, or do you have any feedback or notes that need to be addressed?

Please let me know if there is anything I should modify.

Thanks!

[hamedhani1998]

ar: Fix spotless formatting and remove unused imports