refactor: change Subscription Array to Subscription Set

[OnlyWick]

The main purpose is to avoid the repeated storage of the same function.

const store = useCounterStore()
const test = () => {
  console.log("Hi, Wick");
}
store.$subscribe(test)  // subscriptions.length = 1
store.$subscribe(test)  // subscriptions.length = 2
store.$subscribe(test)  // subscriptions.length = 3

Using a Set can directly avoid this problem and reduce memory waste.

const store = useCounterStore()
const test = () => {
  console.log("Hi, Wick");
}
store.$subscribe(test)  // subscriptions.length = 1
store.$subscribe(test)  // subscriptions.length = 1
store.$subscribe(test)  // subscriptions.length = 1

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commit: 5cbd956

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.72%. Comparing base (2071db2) to head (5cbd956).
Report is 8 commits behind head on v2.

Additional details and impacted files

@@            Coverage Diff             @@
##               v2    #2862      +/-   ##
==========================================
- Coverage   88.75%   88.72%   -0.03%     
==========================================
  Files          19       19              
  Lines        1449     1446       -3     
  Branches      226      226              
==========================================
- Hits         1286     1283       -3     
  Misses        162      162              
  Partials        1        1              

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