fix: add namespaced and strict properties to store interfaces

[daniluk4000]

Add namespaced property to store interfaces to resolve types break in template

Closes #271

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[codecov]

Codecov Report

Merging #272 (369d935) into main (c68d689) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##              main      #272   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           10        10           
  Lines          117       117           
  Branches        28        28           
=========================================
  Hits           117       117           

Impacted Files	Coverage Δ
packages/typed-vuex/src/types/store.ts	100.00% <ø> (ø)

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