Make `NodeRef` Reactive

[wainwrightmark]

Closes #492

[codecov[bot]]

Codecov Report

Base: 64.65% // Head: 64.65% // Increases project coverage by +0.00% :tada:

Coverage data is based on head (b9f60cd) compared to base (5af3dbc). Patch coverage: 87.50% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #508   +/-   ##
=======================================
  Coverage   64.65%   64.65%           
=======================================
  Files          52       52           
  Lines        8527     8528    +1     
=======================================
+ Hits         5513     5514    +1     
  Misses       3014     3014           

Impacted Files	Coverage Δ
packages/sycamore-core/src/noderef.rs	66.66% <87.50%> (+1.14%)	:arrow_up:

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