This is needed to use the import sorter

Sort order
1. External dependencies
2. Internal absolute dependencies (@kbn/..., src/...)
3. Internal relative dependencies

Also cleaned up some relative dependencies in the process.

Adds ESLint rule to enforce this.

Splits out most components into separate chunks

An error was getting logged to the console because jsdom does not
support window.location.reload() out of the box.

Rename it from 'CopySavedObjectsToSpaceFlyout' to
'CopyToSpaceFlyoutInternal'.

Rename it from 'SpaceAvatar' to 'SpaceAvatarInternal'

This was statically imported by the Security plugin so it required
quite a bit of refactoring.

Reduces page load bundle by 29KB

Thought this would decrease the page load bundle size, but it only
shaved off a few hundred bytes. At any rate, this change cleans up
the code a bit, and will be needed when we eventually expose this
as a reusable component for outside consumers.

Components exposed in the public contract are now wrapped and
automatically lazy-loaded. Consumers no longer have to handle this.

If we have an exception where we do not use an error boundary, I
added a comment explaining why.
I also standardized our usages of `lazy` and `Suspense` by
destructuring the React import.