Resolve open issues around FS-dependency in source generators

[captainsafia]

The implementation of the RazorSourceGenerator that we created relies on file system interactions in two places:

• when computing the generated Razor files as part of compilation
• when reading/writing the tag helper cache during compilation

FS-access for source generators is not recommended so we need to resolve this long term. Some thoughts:

• We need to determine if tooling relies on the tag helper cache being in the file system. If not, then we can nuke that particular bit of code. If so, we might want to consider alternative ways for generating this cache.
• Our work to bundle the views with the app assembly should render the generated Razor files unnecessary.

[ghost]

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We're moving this issue to the Next sprint planning milestone for future evaluation / consideration. We will evaluate the request when we are planning the work for the next milestone. To learn more about what to expect next and how this issue will be handled you can read more about our triage process here.