fix: support multiple useSWRInfinite hooks in a page

[koba04]

fixes #976
This PR fixes issues caused by using multiple useSWRInfinite on a page.
You can see the issues in the following link (v0.42).

• v0.42: https://codesandbox.io/s/swr-basic-forked-nw6z4
• THIS PR: https://codesandbox.io/s/swr-basic-forked-uo7r0

This PR also fixes #976.
https://codesandbox.io/s/swr-basic-forked-mbx6y

I guess this is a naive implementation and would change some behaviors of useSWRInfinite, so it should be merged carefully.

[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 1b111ef:

Sandbox	Source
SWR-Basic	Configuration
SWR-States	Configuration
SWR-Infinite	Configuration
SWR-Basic (forked)	PR
SWR-Basic (forked)	PR
SWR-Basic (forked)	PR
agitated-drake-3hzu3	Issue #976

[koba04]

Why has the CodeSandbox build been failed?

ModuleNotFoundError
Could not find module in path: 'swr' relative to '/src/App.js'

[promer94]

After #995 codesandbox ci seems broken 🥲 . I am working on it

[promer94]

swr/tsconfig.json

Lines 25 to 28 in 66aaefd

	"include": [
	"src/**/*",
	"./jest-setup.ts"
	],

Adding new item in include filed would change the esm directory structure 🙈
should be fixed in #1011

[koba04]

@promer94 I got it, thank you!

[koba04]

I've confirmed that this doesn't work, so I'll investigate more.
https://codesandbox.io/s/swr-basic-forked-s0dgl?file=/src/App.js

[koba04]

all tests now have been passed 🎉 But I have to refactor the implementation to get this merged.

[koba04]

I wanted to re-use useIsomorphicLayoutEffect in useSWRInfinite, but I didn't want to expose it from use-swr, so I've moved it to web-presets and imported it.

[koba04]

This is now ready for review again 🚀