Fixes to EuiSearchBar etc types

[pugnascotia]

Closes #3138.

• Rename FilterConfig to SearchFilterConfig and export it via EuiSearchBar.
• Export FieldValueOptionType via EuiSearchBar.
• Change EuiSearchBoxProps to extend EuiFieldSearchProps, so that it includes all the HTML properties such as disabled. Also rework the related component code to forward on more props via ...rest.

[pugnascotia]

@bevacqua I think this PR address most of the points you raised in #3138. The only one left is the autoClose point. This is supported by the <FieldValueSelectionFilter> component, but it isn't available for use via <EuiSearchBar> (for boring code reasons).

@chandlerprall we could address this by moving autoClose into the FieldValueSelectionFilterConfigType type - what do you think? It would mean fiddling about default props and such.

[kibanamachine]

Preview documentation changes for this PR: https://eui.elastic.co/pr_3147/

[chandlerprall]

we could address this by moving autoClose into the FieldValueSelectionFilterConfigType type - what do you think? It would mean fiddling about default props and such.

I don't see how autoClose could ever have been used in its current form. We don't export FieldValueSelectionFilter in a consumable way, so I believe autoClose can be moved to the config object with no problems.

[kibanamachine]

Preview documentation changes for this PR: https://eui.elastic.co/pr_3147/

[chandlerprall]

Changes LGTM! Thanks @pugnascotia

[bevacqua]

Thanks folks!

[kibanamachine]

Preview documentation changes for this PR: https://eui.elastic.co/pr_3147/