Support setting class on SVG elements

[lukechu10]

Fixes #391

[codecov]

Codecov Report

Merging #398 (3a65c9a) into master (a3bc95c) will decrease coverage by 0.10%.
The diff coverage is 7.14%.

@@            Coverage Diff             @@
##           master     #398      +/-   ##
==========================================
- Coverage   63.21%   63.10%   -0.11%     
==========================================
  Files          48       48              
  Lines        7742     7749       +7     
==========================================
- Hits         4894     4890       -4     
- Misses       2848     2859      +11     

Impacted Files	Coverage Δ
packages/sycamore-reactive/src/signal.rs	85.19% <ø> (ø)
packages/sycamore/src/generic_node/dom_node.rs	0.00% <0.00%> (ø)
packages/sycamore-macro/src/view/codegen.rs	96.23% <100.00%> (-0.04%)	⬇️

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[github-actions]

Finished dev [unoptimized + debuginfo] target(s) in 0.04s
 Running `/home/runner/work/sycamore/sycamore/sycamore/target/debug/bench-diff ../../../../js-framework-benchmark/webdriver-ts/results.json`

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               |       111.84 |   136.88 |  143.40 |   +4.76%
- 02_replace1k           |       118.74 |   151.22 |  160.37 |   +6.05%
+ 03_update10th1k_x16    |       387.45 |   406.87 |  380.98 |   -6.36%
  04_select1k            |        63.40 |    65.49 |   67.36 |   +2.86%
  05_swap1k              |        95.15 |    96.10 |   93.84 |   -2.35%
  06_remove-one-1k       |        29.39 |    30.33 |   30.52 |   +0.63%
  07_create10k           |      1187.43 |  1643.80 | 1667.24 |   +1.43%
  08_create1k-after1k_x2 |       273.46 |   336.76 |  326.94 |   -2.92%
+ 09_clear1k_x8          |        89.39 |   117.93 |  112.22 |   -4.84%
  21_ready-memory        |         1.26 |     1.23 |    1.23 |   +0.03%
  22_run-memory          |         1.14 |     1.49 |    1.49 |   -0.38%
+ 23_update5-memory      |         1.14 |     1.73 |    1.48 |  -14.25%
- 24_run5-memory         |         1.30 |     1.64 |    1.77 |   +7.58%
- 25_run-clear-memory    |         1.21 |     1.08 |    1.22 |  +13.08%
- 31_startup-ci          |      1844.13 |  1938.90 | 2116.90 |   +9.18%
- 32_startup-bt          |        29.22 |    39.84 |   41.77 |   +4.86%
  34_startup-totalbytes  |       189.16 |   276.50 |  276.55 |   +0.02%

Workflow: 2018856640
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