perf: how to do code split in a sunmao-ui application

[Yuyz0112]

What problem does this feature solve?

When we talk about web UI performance, load speed is one of the most important metrics. The basic idea of improving load speed is to do code splits which let the browser lazy load code.

The code split technical is widely used in our daily development, but in sunmao-ui, we do not have the equivalent ability yet.

lazy load component and trait

TBD

split application schema

TBD

What does the proposed API look like?

TBD

[tanbowensg]

Module is one of the ways to split code. It can not only wrap components(which makes the leftTree clearer), but also prevent user using global state everywhere.

[tanbowensg]

In this issue #417, we discussed using application to render module which means we could use multiple nested sunmao instance to render an appliaction. Further more, we can use router component to render multiple pages application.