Emit a warning when EmbeddedResourceUseDependentUponConvention is true and first type in a file doesn't match file name.

[smoothdeveloper]

When a project defines <EmbeddedResourceUseDependentUponConvention>true</EmbeddedResourceUseDependentUponConvention>, and a SomeName.cs file has a matching SomeName.resx file, one expects things to go smoothly.

It may occur that a type is added at the top of the SomeName.cs file, and the resource gets renamed by that fact.

I believe generating a warning in this case, pointing to the documentation (https://learn.microsoft.com/en-us/dotnet/core/project-sdk/msbuild-props#embeddedresourceusedependentuponconvention) would alleviate the troubleshooting steps.

Describe the solution you'd like

res1111: project defines EmbeddedResourceUseDependentUponConvention, and file SomeName.cs and SomeName.resx were matched, although the first type defined in SomeName.cs doesn't match SomeName, the embedded resource may be generated under the wrong name.