styles: first try of removing global eui styles

[jusa3]

With great help from @Pooya-Oladazimi we found a possible solution for global style injection and overwriting consuming app syles. Solves #144

We disabled the global style option in the Elastic UI Provider (EuiProvider) and created a wrapper with the missing styles from EuiProvider.

Applied to Autocomplete and DataContent widgets as a test.

What do you think of this implementation @Pooya-Oladazimi ?

[Pooya-Oladazimi]

@jusa3

Thanks for the quick implementation. It is nice. We just need to introduce a wrapper CSS class like ".sem-widget" and use that to narrow down the CSS file selectors. like instead of:
a{}
we use
.sem-widget a {}

so that we only change the anchor style inside the widgets and not globally.

[Pooya-Oladazimi]

@jusa3

one potential approach is to use another UI lib Material UI. especially because of this:
https://mui.com/material-ui/getting-started/usage/#globals