support anonymous types nested in generic interceptor signatures

[koenbeuk]

       query
            .Select(x => new { x.Tag })
            .GroupBy(x => x.Tag)
            .Select(x => x.Count())
            .ToListAsync(cancellationToken);

used to fail to compile

[codecov]

Codecov Report

❌ Patch coverage is 85.96491% with 8 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...iveSharp.Generator/PolyfillInterceptorGenerator.cs	82.35%	4 Missing and 2 partials ⚠️
...pressiveSharp.Generator/Emitter/TypeFqnResolver.cs	90.47%	1 Missing and 1 partial ⚠️

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