Create a new nested scope if ctx is used within a dyn fragment

[lukechu10]

If the identifier ctx is used inside a dynamic expression inside the view! macro, a new scoped effect will be automatically created instead. This prevents memory leaks when the effect reruns.

[codecov]

Codecov Report

Merging #364 (6dfebab) into master (a71d31d) will increase coverage by 0.43%.
The diff coverage is 95.34%.

❗ Current head 6dfebab differs from pull request most recent head a75d805. Consider uploading reports for the commit a75d805 to get more accurate results

@@            Coverage Diff             @@
##           master     #364      +/-   ##
==========================================
+ Coverage   63.10%   63.53%   +0.43%     
==========================================
  Files          48       48              
  Lines        7496     7569      +73     
==========================================
+ Hits         4730     4809      +79     
+ Misses       2766     2760       -6     

Impacted Files	Coverage Δ
packages/sycamore/src/generic_node/ssr_node.rs	78.97% <ø> (ø)
packages/sycamore-macro/src/view/mod.rs	60.00% <50.00%> (-0.72%)	⬇️
packages/sycamore/src/view.rs	75.36% <94.44%> (+2.86%)	⬆️
packages/sycamore-macro/src/view/codegen.rs	95.94% <100.00%> (+0.04%)	⬆️
packages/sycamore-macro/src/view/ir.rs	100.00% <100.00%> (ø)
packages/sycamore-reactive/src/context.rs	100.00% <100.00%> (+17.18%)	⬆️
website/src/main.rs	0.58% <0.00%> (-0.02%)	⬇️

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