Add coil3 extension

[lightsummer233]

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[Copilot]

Pull request overview

This PR adds a new kermit-coil3 extension module so Coil 3’s logging can be routed into Kermit, plus the necessary Gradle wiring to include/publish the new extension.

Changes:

• Register the new :kermit-coil3 Gradle module and add Coil 3 to the version catalog.
• Introduce KermitCoil3Logger implementing Coil 3’s Logger, plus level/Severity conversion extensions.
• Add module build configuration, public API dumps, and end-user README documentation.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
settings.gradle.kts	Includes the new :kermit-coil3 project and maps it to extensions/kermit-coil3.
gradle/libs.versions.toml	Adds Coil 3 version and coil3-core library alias for dependency management.
extensions/kermit-coil3/src/commonMain/kotlin/co/touchlab/kermit/coil3/KermitCoil3Logger.kt	Adds a Coil 3 Logger implementation backed by a Kermit Logger.
extensions/kermit-coil3/src/commonMain/kotlin/co/touchlab/kermit/coil3/Extensions.kt	Adds public conversion extensions between Coil 3 Logger.Level and Kermit Severity.
extensions/kermit-coil3/README.md	Documents how to wire KermitCoil3Logger into a Coil 3 ImageLoader.
extensions/kermit-coil3/build.gradle.kts	Adds the new KMP extension module build/publish configuration and targets.
extensions/kermit-coil3/api/jvm/kermit-coil3.api	Adds JVM API dump for binary compatibility tracking.
extensions/kermit-coil3/api/android/kermit-coil3.api	Adds Android API dump for binary compatibility tracking.

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