Add support for SVG

[lukechu10]

Closes #288

[codecov]

Codecov Report

Merging #389 (dd838f2) into master (c3a6ba4) will decrease coverage by 0.28%.
The diff coverage is 49.09%.

@@            Coverage Diff             @@
##           master     #389      +/-   ##
==========================================
- Coverage   63.55%   63.26%   -0.29%     
==========================================
  Files          47       47              
  Lines        7693     7725      +32     
==========================================
- Hits         4889     4887       -2     
- Misses       2804     2838      +34     

Impacted Files	Coverage Δ
packages/sycamore/src/generic_node/dom_node.rs	0.00% <0.00%> (ø)
packages/sycamore/src/generic_node/hydrate_dom.rs	0.00% <0.00%> (ø)
packages/sycamore/src/generic_node/mod.rs	100.00% <ø> (ø)
packages/sycamore/src/builder.rs	24.07% <50.00%> (ø)
packages/sycamore/src/generic_node/ssr_node.rs	76.44% <91.66%> (-2.28%)	⬇️
packages/sycamore-macro/src/view/codegen.rs	95.98% <100.00%> (-0.03%)	⬇️
packages/sycamore/src/noderef.rs	77.96% <100.00%> (ø)

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