[Fix]: selectors always cause re-render because of always return a new function

[ShinyLeee]

Description

This PR contains below fixes:

• selectors always cause re-render because of always return a new function: In extendSelectors#L41 always return a new function builder(state, api.get, api)[key] which cause re-render every time.
• fix extendSelectors argument typo in README: Also in extendSelectors#L41 , the first arguments is state, but we named it set in README while extendActions is correct.
• correct equalityFn typing: This is my missing, the equalityFn receive the current key's data structure instead of the whole store structure.

[changeset-bot]

🦋 Changeset detected

Latest commit: 8671fcd

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@udecode/zustood	Patch

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[ShinyLeee]

And maybe we should add more test for this library in the future.

[zbeyens]

LGTM