Remove ASP.NET-specific references from hot reload agent source

[stephentoub]

The hot reload support currently uses ASP.NET-specific naming in assemblies, files, classes, etc. (e.g. "AspNetCoreDeltaApplier"), but it's not ASP.NET-specific. For improved code hygiene and clarity, we should rename all of this to reflect its greater applicability.

cc: @pranavkm

I couldn't figure out the best area label to add to this issue. If you have write-permissions please help me learn by adding exactly one area label.

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