feat: access the state and getters through this

[posva]

• Removes the need of writing .state in this.state.name = 'eduardo': this.name = 'Eduardo'
• Removes the need of using .value for getters

What kind of change does this PR introduce? (check at least one)

• Bugfix
• Feature
• Code style update
• Refactor
• Build-related changes
• Other, please describe:

Does this PR introduce a breaking change? (check one)

• Yes
• No

If yes, please describe the impact and migration path for existing applications:

The PR fulfills these requirements:

• When resolving a specific issue, it's referenced in the PR's title (e.g. fix #xxx[,#xxx], where "xxx" is the issue number)
• All tests are passing
• New/updated tests are included

If adding a new feature, the PR's description includes:

• A convincing reason for adding this feature (to avoid wasting your time, it's best to open a suggestion issue first and wait for approval before working on it)

Other information:

[codecov-commenter]

Codecov Report

Merging #190 into master will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #190   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            5         5           
  Lines          112       117    +5     
  Branches        19        19           
=========================================
+ Hits           112       117    +5     

Impacted Files	Coverage Δ
src/index.ts	100.00% <ø> (ø)
src/types.ts	100.00% <ø> (ø)
src/ssrPlugin.ts	100.00% <100.00%> (ø)
src/store.ts	100.00% <100.00%> (ø)

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