ADR 004: Strict props or Composite components (primer#1703)

* Add ADR for children as API

* add adrs to eslint ignore list

* editing phase 1

* add NewButton examples

* lol title

* Replace accidental Button usage

* change title

* add renderChild to the example

* Apply suggestions from code review

Co-authored-by: Leslie Cohn-Wein <lesliecdubs@github.com>
Co-authored-by: Cole Bemis <colebemis@github.com>

* Apply suggestions from code review

Co-authored-by: Cole Bemis <colebemis@github.com>

* Add decision

* Update contributor-docs/adrs/adr-004-children-as-api.md

* clarify ActionMenu example is from legacy version

* removed sidenote because it feels like a tangent

Co-authored-by: Leslie Cohn-Wein <lesliecdubs@github.com>
Co-authored-by: Cole Bemis <colebemis@github.com>