Configure Spotless through the convention plugins

[gpunto]

Goal

AND-880

As the title says.

Note: I'm not running spotlessApply here to avoid bundling the migration with all the Spotless changes. I'll do it in a follow up. What will change is the XML header because it was different.

Implementation

Replace local Spotless configuration with the convention.

🎨 UI Changes

None

Testing

Run spotlessApply and verify that the files are updated accordingly.

☑️Contributor Checklist

General

• I have signed the Stream CLA (required)
• Assigned a person / code owner group (required)
• Thread with the PR link started in a respective Slack channel (required internally)
• PR targets the develop branch
• PR is linked to the GitHub issue it resolves

Code & documentation

• Changelog is updated with client-facing changes
• New code is covered by unit tests
• Comparison screenshots added for visual changes
• Affected documentation updated (KDocs, docusaurus, tutorial)
• Tutorial starter kit updated
• Examples/guides starter kits updated (stream-video-examples)

☑️Reviewer Checklist

• XML sample runs & works
• Compose sample runs & works
• Tutorial starter kit
• Example starter kits work
• UI Changes correct (before & after images)
• Bugs validated (bugfixes)
• New feature tested and works
• Release notes and docs clearly describe changes
• All code we touched has new or updated KDocs
• Check the SDK Size Comparison table in the CI logs

🎉 GIF

Please provide a suitable gif that describes your work on this pull request

[github-actions]

PR checklist ✅

All required conditions are satisfied:

• Title length is OK (or ignored by label).
• At least one pr: label exists.
• Sections ### Goal, ### Implementation, and ### Testing are filled.

🎉 Great job! This PR is ready for review.

[github-actions]

SDK Size Comparison 📏

SDK	Before	After	Difference	Status
stream-video-android-core	11.93 MB	11.93 MB	0.00 MB	🟢
stream-video-android-ui-xml	5.68 MB	5.68 MB	0.00 MB	🟢
stream-video-android-ui-compose	6.27 MB	6.27 MB	0.00 MB	🟢

[sonarqubecloud]

Quality Gate passed

Issues
0 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

[rahul-lohra]

lgtm