Pro/cons of named import vs source code use

[interactivellama]

Add additional documentation in readme about pros and cons of using each import system (CJS/ESM vs Source)

[interactivellama]

Currently CJS/ESM exports such as import { Input } from @salesforce/design-system-react use the old callback parameters for onChange. See release 0.8.16

Moves Input, Checkbox, and Textarea out of component/forms and directly into component/. Old paths such as component/forms/input will still work, but include a console warning as deprecated.

components/input, components/checkbox, and components/textarea pass different parameters into the onChange callback. onChange now passes in event, { checked } if the new paths are used. The parameters used to be checked, event, { checked }. If you use the new paths such as components/input, please update your parameter variables. This aligns the callback's parameters with the rest of the library's callback functions.

This means that the documentation only agrees with the source imports and not the CommonJS version.

The original goal of this was to only break the CommonJS version at a 1.0 release.