Source map support for atomic declarations

[itsdouges]

When we move to atomic declarations what can we do for source map support?

The main premise we need is - ensure developers have a way to back track to their code. We can't roll back to all in one declarations because that will break behaviour. We need another method.

One idea I have - when building in DEV (NODE_ENV !== 'production') we add an extra property declaration that we can map back, as well as maybe put some fun metadata in it.

.componentName--sourcemap {
  name: componentName;
  line: 20;
  filename: filename.tsx,
}

And then the source map would only apply to this declaration.

Make sure to action these tickets when picking this up:

• https://github.com/atlassian-labs/compiled/issues/161
• https://github.com/atlassian-labs/compiled/issues/160