Extend the functionality of top-level statements to static methods.

[GaN8373]

Allow writing C# static methods directly within a file, similar to Program.cs top-level statements, without requiring an explicit static class declaration. Implicitly assume the namespace as <project>.<folder>.<fileName>,

while still supporting explicit namespace declarations for overrides. Internally, these methods can be considered to belong to an implicit static class named _static_g

I Think This approach is feasible in C# due to its support for multiple classes within a single file, allowing for the grouping of these top-level static methods into a common static class.

[huoyaoyuan]

This will have a side effect to make source code sensitive to filesystem structure, which is disliked in many other discussions.

If you need exposable methods, use exposable approach (class).

[HaloFour]

See: https://github.com/dotnet/csharplang/blob/main/meetings/2020/LDM-2020-09-28.md#top-level-functions