Report unused `exclude` clauses in dependencies

**Is your feature request related to a problem? Please describe.**
It's not a problem but is a nice feature to have.

**Describe the solution you'd like**
Say I have this script:
```groovy
implementation('some:dependency:1.0.0') {
exclude group: 'this.is.not.actually.a', module: 'dependency'
}
```
`some:dependency` doesn't have `this.is.not.actually.a:dependency` as a dependency. Or it used to but I've updated it to a new version and now it doesn't. It would be nice to get a report that this exclusion is unneeded.

**Describe alternatives you've considered**
N/A

**Additional context**
[Gradle Lint](https://github.com/nebula-plugins/gradle-lint-plugin/) has a similar feature.

The issue names no implementation files or tests. Start by locating the dependency-analysis code that processes Gradle exclude clauses and compare its behavior with the similar Gradle Lint feature. Done means reporting an exclusion whose target is not a dependency of the declared module, including the shown version-change case, with tests for that example.

Written by the indexing model from the issue text.