fix: bundle kotlinx-serialization for Azora extension

[hamedhani1998]

• Add implementation(libs.kotlin.json) to include kotlinx-serialization-json at runtime
• Bump extVersionCode to 5
• Add packaging exclusion for kotlin-tooling-metadata.json

Fixes NoClassDefFoundError: kotlinx.serialization.internal.GeneratedSerializer$-CC crash

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