breaking(middleware): drop deprecated persist options and make removeItem required

[dai-shi]

for v4.

[codesandbox-ci]

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Latest deployment of this branch, based on commit 2cb29bb:

Sandbox	Source
React	Configuration
React Typescript	Configuration
React Browserify	Configuration
React Snowpack	Configuration
React Parcel	Configuration
Next.js	Configuration

[github-actions]

Size Change: -1.25 kB (-3%)

Total Size: 35.2 kB

Filename	Size	Change
dist/esm/middleware.js	3.41 kB	-210 B (-6%)	✅
dist/middleware.js	3.5 kB	-218 B (-6%)	✅
dist/system/middleware.development.js	3.52 kB	-214 B (-6%)	✅
dist/system/middleware.production.js	2.46 kB	-207 B (-8%)	✅
dist/umd/middleware.development.js	3.61 kB	-218 B (-6%)	✅
dist/umd/middleware.production.js	2.46 kB	-187 B (-7%)	✅

ℹ️ View Unchanged

Filename	Size
dist/context.js	622 B
dist/esm/context.js	521 B
dist/esm/index.js	1.24 kB
dist/esm/shallow.js	272 B
dist/esm/vanilla.js	536 B
dist/index.js	1.35 kB
dist/shallow.js	318 B
dist/system/context.development.js	639 B
dist/system/context.production.js	456 B
dist/system/index.development.js	1.37 kB
dist/system/index.production.js	887 B
dist/system/shallow.development.js	338 B
dist/system/shallow.production.js	253 B
dist/system/vanilla.development.js	609 B
dist/system/vanilla.production.js	381 B
dist/umd/context.development.js	763 B
dist/umd/context.production.js	559 B
dist/umd/index.development.js	1.49 kB
dist/umd/index.production.js	967 B
dist/umd/shallow.development.js	447 B
dist/umd/shallow.production.js	344 B
dist/umd/vanilla.development.js	775 B
dist/umd/vanilla.production.js	497 B
dist/vanilla.js	634 B

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