Builder doctests

[alsuren]

There are a few tests that I have left as "compile_fail" because I don't fully understand how contexts and signals are expected to work in 0.8. Search for FIXME in the diff, to find them. Any guidance that can be provided on these points would be greatly appreciated.

[codecov]

Codecov Report

Merging #370 (d4e0f65) into master (499c9bb) will increase coverage by 0.00%.
The diff coverage is 25.00%.

@@           Coverage Diff           @@
##           master     #370   +/-   ##
=======================================
  Coverage   63.53%   63.54%           
=======================================
  Files          48       48           
  Lines        7569     7570    +1     
=======================================
+ Hits         4809     4810    +1     
  Misses       2760     2760           

Impacted Files	Coverage Δ
packages/sycamore/src/builder/agnostic/mod.rs	5.96% <0.00%> (ø)
packages/sycamore-macro/src/view/parse.rs	93.33% <100.00%> (+0.03%)	⬆️

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[lukechu10]

Hello there. Sorry for taking so long to get to this.
With the new v2 reactive primitives, the old builder API didn't really play well with it, mainly because I kind of just changed the function signatures to make it compile without any attention to ergonomics.
I actually completely overhauled the builder API in #373 which makes the old builder API obsolete, so unfortunately, I'll be closing this PR now. Sorry again for all the work you put into this.
Thanks for understanding.