implement full-state computed properties

[Rich-Harris]

fixes #1303

[codecov-io]

Codecov Report

Merging #1377 into master will increase coverage by 0.05%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1377      +/-   ##
==========================================
+ Coverage   91.11%   91.16%   +0.05%     
==========================================
  Files         120      120              
  Lines        4421     4426       +5     
  Branches     1360     1362       +2     
==========================================
+ Hits         4028     4035       +7     
+ Misses        156      155       -1     
+ Partials      237      236       -1

Impacted Files	Coverage Δ
src/validate/js/propValidators/computed.ts	91.66% <ø> (+6.48%)	⬆️
src/compile/ssr/index.ts	96.22% <100%> (ø)	⬆️
src/compile/dom/index.ts	96% <100%> (+0.06%)	⬆️
src/compile/Compiler.ts	96.01% <100%> (+0.08%)	⬆️

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