refactor(core)!: core rewrite for maintainability

[lihbr]

Types of changes

• [ ] Chore (a non-breaking change which is related to package maintenance)
• [x] Bug fix (a non-breaking change which fixes an issue)
• [x] New feature (a non-breaking change which adds functionality)
• [x] Breaking change (fix or feature that would cause existing functionality to change)

Description

WIP

Resolves: #5, #6

Checklist:

• [ ] My change requires an update to the official documentation.
• [ ] All TSDoc comments are up-to-date and new ones have been added where necessary.
• [ ] All new and existing tests are passing.

🦜

[github-actions[bot]]

size-limit report 📦

Path	Size
./packages/com/dist/index.js	3.75 KB (0%)
./packages/com/dist/index.cjs	3.76 KB (0%)
./packages/core/dist/index.js	5.81 KB (-66.4% 🔽)
./packages/core/dist/index.cjs	6.53 KB (-63.65% 🔽)
./packages/react/dist/index.js	8.96 KB (-56.05% 🔽)
./packages/react/dist/index.cjs	9.87 KB (-53.47% 🔽)
./packages/vue/dist/index.js	6.25 KB (-64.55% 🔽)
./packages/vue/dist/index.cjs	7.02 KB (-61.82% 🔽)
./packages/vue3/dist/index.js	14.6 KB (-43.87% 🔽)
./packages/vue3/dist/index.cjs	158.79 KB (-6.89% 🔽)

[codecov-commenter]

Codecov Report

Merging #7 (e0237f6) into master (4079eec) will decrease coverage by 4.35%. The diff coverage is 14.42%.

@@            Coverage Diff             @@
##           master       #7      +/-   ##
==========================================
- Coverage   60.90%   56.55%   -4.36%     
==========================================
  Files          30       27       -3     
  Lines         550      603      +53     
  Branches      104      109       +5     
==========================================
+ Hits          335      341       +6     
- Misses        215      262      +47     

Impacted Files	Coverage Δ
packages/com/src/channel/messages.ts	100.00% <ø> (ø)
packages/core/src/lib/EventEmitter.ts	14.28% <0.00%> (-2.39%)	:arrow_down:
packages/core/src/StateManager.ts	6.18% <5.08%> (-0.16%)	:arrow_down:
packages/react/src/SliceSimulator.tsx	12.12% <5.88%> (-0.38%)	:arrow_down:
packages/vue3/src/SliceSimulator.ts	18.18% <6.66%> (-1.05%)	:arrow_down:
packages/vue/src/SliceSimulator.ts	16.66% <8.33%> (+0.87%)	:arrow_up:
packages/core/src/CoreManager.ts	12.72% <12.72%> (ø)
packages/core/src/DOMHelpers.ts	14.81% <14.81%> (ø)
packages/core/src/eventHandlers.ts	22.22% <33.33%> (ø)
packages/core/src/getDefault.ts	66.66% <66.66%> (ø)
... and 2 more

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