experimental(core): expose unstable_derive (#2652)

* experimental(core): expose unstable_derive instead of unstable_is

* chore: remove empty line

* chore types

* follow resolveAtom in #2609

* store test from #2609

* adjust store.test.tsx for unstable_derive

* limit atom state map type

* add test with atom state map

* update test using unstable_derive

* drop resolveAtom, add derive atom test

* simplify unstable_derive

* wip: this works but i do not like it

* separate atomstate and atomcontext

* for old ts

* fix

* fix 2

* simplify a bit with dev breaking changes

* revert to bd9c6c0, except for new test

* refactor (skipping the new test for now)

* refactor 2

* revert those refactors :-p

* wip: hm, how is bundle size?

* fix tests

* add test for unstable_derive (#2665)

* add a failing test

* wip: failed attempt

* split unstable_derive test

* wip: failed attempt 2

* revert failing tests

* empty commit

* restore unstable_is of now (we will remove it in the later version.)

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Co-authored-by: David Maskasky <[email protected]>
Co-authored-by: David Maskasky <[email protected]>