properly isolate #[allow(clippy::..)] to generated code

[youknowone]

see #739 (comment)

[dburgener]

I attempted to address this with #784, which followed the suggestion linked above. The issue pointed out in that PR review, is that adding the layer of indirection on the non-action portions doesn't really accomplish much, since each pub parser is in its own module anyways.

It may be more desirable to add any needed clippy exceptions directly on the parse mods.