feat(types): support IDE features for store context

[johnsoncodehk]

Fixed:

const useFoo = defineStore('foo', () => ({ bar: 123 }));
const foo = useFoo();
foo.bar // <-- renaming, goto definition, find references not working for bar

[netlify]

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[posva]

Thanks a lot! Can you make sure the tests pass? Formatting seems to be failing

[codecov-commenter]

Codecov Report

Merging #924 (9d3e369) into v2 (b7b2c79) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##               v2     #924   +/-   ##
=======================================
  Coverage   99.73%   99.73%           
=======================================
  Files           9        9           
  Lines         382      382           
  Branches       97       97           
=======================================
  Hits          381      381           
  Partials        1        1           

Impacted Files	Coverage Δ
packages/pinia/src/types.ts	100.00% <ø> (ø)

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