breaking(core): drop v2 hook compatibility

[dai-shi]

for v4.

[codesandbox-ci]

This pull request is automatically built and testable in CodeSandbox.

To see build info of the built libraries, click here or the icon next to each commit SHA.

Latest deployment of this branch, based on commit ef7d933:

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

[github-actions]

Size Change: -708 B (-2%)

Total Size: 35.8 kB

Filename	Size	Change
dist/esm/index.js	1.12 kB	-119 B (-10%)	👏
dist/index.js	1.22 kB	-128 B (-9%)	✅
dist/system/index.development.js	1.25 kB	-121 B (-9%)	✅
dist/system/index.production.js	781 B	-106 B (-12%)	👏
dist/umd/index.development.js	1.36 kB	-127 B (-9%)	✅
dist/umd/index.production.js	860 B	-107 B (-11%)	👏

ℹ️ View Unchanged

Filename	Size
dist/context.js	622 B
dist/esm/context.js	521 B
dist/esm/middleware.js	3.62 kB
dist/esm/shallow.js	272 B
dist/esm/vanilla.js	536 B
dist/middleware.js	3.71 kB
dist/shallow.js	318 B
dist/system/context.development.js	639 B
dist/system/context.production.js	456 B
dist/system/middleware.development.js	3.73 kB
dist/system/middleware.production.js	2.67 kB
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/middleware.development.js	3.83 kB
dist/umd/middleware.production.js	2.64 kB
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

_{compressed-size-action}