[Feature] Improve the performance that proxy static files

[barnettZQG]

Is your feature request related to a problem? Please describe.

Now, the VelaUX server proxies the UI static files and the static files of the plugin. But the performance is only just passable.

Describe the solution you'd like

There are some optimization measures:

1. Add the gzip handler and compressed the static file by default. (Required)
2. Cache the static file to memory when in the prod environment. Includes platform js and plugin js.