Implement ToView manually for types

[lukechu10]

This lets us do some nice things such as:

let show = true;
view! { cx,
    (show.then(|| view! { cx, "Hello!" }))
}

Breaking Changes:

• IntoView renamed to ToView (which is more idiomatic in Rust)
• IntoView::create renamed to ToView::to_view
• Not all types that implement Display now implement ToView. For those types that used to implement IntoView but do not now implement ToView, a simple fix would be to just add a to_string() at the call-site.

[codecov]

Codecov Report

Base: 63.21% // Head: 63.24% // Increases project coverage by +0.03% 🎉

Coverage data is based on head (5601e56) compared to base (e217544).
Patch coverage: 66.66% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #541      +/-   ##
==========================================
+ Coverage   63.21%   63.24%   +0.03%     
==========================================
  Files          54       54              
  Lines        8965     8944      -21     
==========================================
- Hits         5667     5657      -10     
+ Misses       3298     3287      -11     

Impacted Files	Coverage Δ
packages/sycamore-core/src/generic_node.rs	75.00% <ø> (-0.45%)	⬇️
packages/sycamore-web/src/dom_node.rs	0.00% <ø> (ø)
website/src/content.rs	0.00% <0.00%> (ø)
website/src/header.rs	0.00% <0.00%> (ø)
packages/sycamore-core/src/view.rs	72.66% <72.91%> (-3.40%)	⬇️
packages/sycamore-macro/src/view/codegen.rs	95.58% <100.00%> (ø)

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[github-actions]

Benchmark Report

• wasm-bindgen: the performance goal
• baseline: performance of sycamore-baseline (typically latest master)
• update: performance of sycamore (typically recent changes)
• diff: measures the improvement of update over the baseline

@@                           Performance Diff                           @@

##                          | wasm-bindgen | baseline |  update |  diff ##
##########################################################################
+ 01_run1k                  |       103.85 |   125.37 |  117.93 |   -5.93%
+ 02_replace1k              |       108.77 |   144.71 |  130.36 |   -9.92%
+ 03_update10th1k_x16       |       222.21 |   273.56 |  244.82 |  -10.51%
+ 04_select1k               |        24.35 |    32.63 |   26.21 |  -19.66%
  05_swap1k                 |        62.24 |    68.70 |   68.35 |   -0.50%
  06_remove-one-1k          |       110.91 |   117.67 |  120.23 |   +2.18%
  07_create10k              |      1071.53 |  1292.23 | 1313.63 |   +1.66%
  08_create1k-after1k_x2    |       240.80 |   269.17 |  273.40 |   +1.57%
- 09_clear1k_x8             |        65.02 |    87.41 |   90.86 |   +3.95%
  21_ready-memory           |         1.86 |     1.85 |    1.85 |   -0.03%
  22_run-memory             |         2.84 |     5.54 |    5.55 |   +0.16%
  23_update5-memory         |         3.00 |     5.70 |    5.70 |   +0.08%
  25_run-clear-memory       |         1.92 |     4.35 |    4.36 |   +0.18%
  26_run-10k-memory         |        13.34 |    39.73 |   39.74 |   +0.02%
- 31_startup-ci             |      1832.45 |  1967.08 | 2032.26 |   +3.31%
  32_startup-bt             |         0.00 |     0.00 |    0.00 |     NaN%
+ 33_startup-mainthreadcost |        18.06 |    14.36 |    9.31 |  -35.17%
  34_startup-totalbytes     |       189.33 |   304.26 |  302.60 |   -0.55%

Workflow: 3666643752
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