Move view.rs from sycamore-macro into sycamore-view-parser codegen.rs

[davidon-top]

This would greatly simplify making 3rd party alternative view macros #23 only having to make the common ir rather then a custom solution that would work basically identically to the existing codegen solution.
Right now the view.rs was not accessible by other crates because the crate it is in is a proc-macro crate.
I know that technically the crate is named sycamore-view-parser and codegen isn't parsing but making a separate crate would be redundant in my opinion since the ir is also needed together with the codegen and i don't think its worth it renaming the crate since its already on crates.io.

Unrelated side note: I am working on and off on Fallible components trying to make it good. I just need a short change (e.g. making sycamore-rstml)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.40%. Comparing base (073d7c4) to head (c07a9c0).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #762   +/-   ##
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  Coverage   71.40%   71.40%           
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  Files          45       45           
  Lines        6644     6644           
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  Hits         4744     4744           
  Misses       1900     1900           

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[lukechu10]

LGTM! I think moving the codegen to sycamore-view-parser makes sense as making the view parser separate was originally meant to allow creating alternative view syntax macros anyways.