<amp-story> Performance gains improvement update

[mlts056]

Can the optimizer now handle the amp-story tag?

In this repo, it is mentioned that the amp-story tag is not supported:

amp-toolbox/packages/optimizer/lib/Extensions.js

Line 27 in e40c5c3

extension === 'amp-story'

amp-toolbox/packages/optimizer/README.md

Line 560 in e40c5c3

- if the`amp-experiment`, `amp-story` or `amp-dynamic-css-classes` components are used ([code](https://github.com/ampproject/amphtml/blob/62a9eab084ccd800d80a371e2cb29cd4f9e8576a/src/render-delaying-services.js#L39-L43)).

However, I think it can now be processed server side:

ampproject/amphtml#37345
ampproject/amphtml#37990
ampproject/amphtml@8848d18

Can amp-toolbox be updated to do all the boiler plate code removal for web stories?

[sebastianbenz]

//cc @erwinmombay