Upgrade component toolchain for dash-table to match `dash-component-boilerplate`

[notatallshaw]

Currently when I use Dash Table in Pycharm it tells me the module dash_table has no attribute DataTable. It seems this is because everything is dynamically loaded, it makes it a lot more difficult to work with compared to other Dash Components.

[chriddyp]

In fact, we already do this in our other component libraries. We just need to upgrade the toolchain to match the enhancements we made in https://github.com/plotly/dash-component-boilerplate

[chriddyp]

@T4rk1n - Could you help @Marc-Andre-Rivet get this one in? It might be good for you to check out another Dash build system

[T4rk1n]

Had a quick look, generating the components classes is mostly just changing __init__.py and the build:py command. I can make a PR for that.

For the dev bundle, I will need @Marc-Andre-Rivet help, the webpack configs are really different.

[T4rk1n]

Changed the component loading to generated classes in #243