Optimize dev check middleware performance

[markerikson]

This PR:

• Optimizes the immutability middleware by:
  • assuming that frozen objects are immutable, which lets us bail out immediately in most cases with Immer
  • replacing array keypaths with strings
  • Tweaking a couple loops
• Optimizes the serializability middleware by:
  • replacing array keypaths with strings
• Adds a new ignoreState option to the serializability middleware that skips checking state entirely

Fixes #885 and fixes #926 .

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Size Change: +246 B (0%)

Total Size: 69.8 kB

Filename	Size	Change
dist/redux-toolkit.cjs.development.js	13.9 kB	+63 B (0%)
dist/redux-toolkit.cjs.production.min.js	5.29 kB	+17 B (0%)
dist/redux-toolkit.esm.js	13.8 kB	+64 B (0%)
dist/redux-toolkit.umd.js	25.7 kB	+84 B (0%)
dist/redux-toolkit.umd.min.js	11 kB	+18 B (0%)

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Filename	Size	Change
dist/index.js	149 B	0 B

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