Detect if the plugin `kotlin-parcelize` is not used

**Is your feature request related to a problem? Please describe.**
Detect unused if a module declares the plugin `id("kotlin-parcelize")` and doesn't use it.

**Describe the solution you'd like**
Raise a suggestion to remove `kotlin-parcelize` if the annotation `@Parcelize` is not used.

Start by tracing how the plugin detects declared plugins and how it determines whether annotations are used. Implement the requested suggestion for modules declaring kotlin-parcelize without @Parcelize usage, and add or update tests covering both usage and non-usage cases.

Written by the indexing model from the issue text.