feat: support vue 3

[danielroe]

• nuxt-typed-vuex (waiting on Vue 3 support in Nuxt)
• typed-vuex
• fix accessor type inference

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[codecov]

Codecov Report

Merging #135 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #135   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            9         9           
  Lines           81        81           
  Branches        15        15           
=========================================
  Hits            81        81           

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