Add defc macro to create fn components with Fast Refresh support

[Deraen]

Investigating if React Refresh support is possible in some way. It will require using a macro, because attaching necessary data to the function (component) just isn't possible when components are created when rendering Hiccup forms (what Reagent normally does.)

• Target is to get React Refresh working
• Working React Refresh will allow better dev experience on a project transitioning from Reagent to UIx/Helix
• As a side-effect this will create function components which work without :f>
• Macro to handle Hiccup or properties transform is not a target (one could probably wrap the macro with Sablono to do that)
• Seems like Refresh works for "old" components being used from defc component also! No need to convert everything to use the macro?
  • It is possible that one old type component will force sub-tree re-mount which prevents keeping Hooks state for anything under that component?? Need to test.
• Does setting forceReset flag cause re-mount always? If so, we might HAVE to create correct signatures to keep state for even UIx components in component tree?

TODO:

• Looks like form-2 components don't work
• Form-3 not tested, not sure if makes even sense
• Check if we could create real Hook signature now that we have macro which can analyze the code (-> keep hook state over reloads if signature doesn't change)

[Deraen]

TODO: Controlled inputs don't work inside defc / or just dereferencing ratoms values.

[roman01la]

I’m curious, if local state will be reset, what’s the motivation to enable react refresh in Reagent?

[Deraen]

To help projects using both Reagent and UIx/Helix, so they can enable it and get benefit on React Refresh for UIx/Helix components.