feat: add "classNameHashSalt" for AOT

[layershifter]

This PR adds classNameHashSalt option for Babel plugin & Webpack loader.

The option will be properly documented once it will be implemented also for runtime.

[github-actions[bot]]

📊 Bundle size report

Package & Exports	Baseline (minified/GZIP)	PR	Change
core makeResetStyles (runtime)	17.14 kB 6.569 kB	17.149 kB 6.577 kB	9 B 8 B
core makeStyles (runtime)	25.85 kB 9.242 kB	25.915 kB 9.263 kB	65 B 21 B
react makeResetStyles (runtime)	19.64 kB 7.562 kB	19.649 kB 7.567 kB	9 B 5 B
react makeStyles (runtime)	28.355 kB 10.228 kB	28.42 kB 10.252 kB	65 B 24 B

Unchanged fixtures

| Package & Exports | Size (minified/GZIP) | | -------------------------------------------------------------------------------------------------------------------------- | -------------------------: | | core
\_\_resetStyles (makeResetStyles) | `273 B`
`197 B` | | core
\_\_styles (makeStyles) | `1.727 kB`
`832 B` | | core
mergeClasses | `1.865 kB`
`900 B` | | core
shorthands.padding() | `4.781 kB`
`1.537 kB` | | react
\_\_css | `1.723 kB`
`812 B` | | react
\_\_styles | `4.187 kB`
`1.832 kB` | | react
makeStaticStyles (runtime) | `9.576 kB`
`4.182 kB` | | shadow-dom
createShadowDOMRenderer | `4.085 kB`
`1.724 kB` |

_{🤖 This report was generated against 3cac9f0799024e21e4efa5439dd90d91732b4fff}