[Built-in analyzer] Item is updated inside a target

### Background

This issue tracks one of the BuildCheck analyzers we would like to ship in-box with MSBuild.

### Goal

Implement an analyzer with the following rule: No item is attempted to be updated using the `Update` attribute inside a target.

### Notes

While the `Update` attribute can be added to items inside a target, it is ignored and the transformation is applied to all items of the given type. Implementing this analyzer will likely require introducing `TaskParameterMessageKind.UpdateItem` to communicate the attempted operation to the analyzer.