Some EuiSearchBar TypeScript issues

[bevacqua]

• EuiSearchBarProps['box'] doesn't understand disabled, but it's valid — we forward extra props to EuiFieldSearch but don't specify that in the types
• Where do I get FilterConfig from? It's a type we use pervasively in Cloud UI but there doesn't seem to be a simple way to access it
• Similar ask about EuiSearchBar['filters'], we'd like this to be exposed as a top level export
• FilterConfig doesn't seem to understand autoClose, but I'm almost certain this is a supported feature as we've had it for a long time in Cloud UI

[bevacqua]

One more, but this one needs a bit of lead up explanation. These are the types we had in Cloud UI:

export type FilterOptionValue = {
  name?: string
  field?: string
  view?: ReactNode
  value?: string | null
}

type DeferredFilterOption = () => Promise<FilterOptionValue[]>

type FilterOptions = FilterOptionValue[] | DeferredFilterOption

export type Filter = {
  name?: string
  type: 'field_value_selection' | 'field_value_toggle_group'
  field?: string
  filterWith?: 'includes'
  multiSelect?: 'or' | 'and' | boolean
  autoClose?: boolean
  loadingMessage?: string
  options?: FilterOptions
  items?: FilterOptions
}

Now that we replaced Filter[] from the code above with EuiSearchBarProps['filters'], we have to get rid of FilterOptionValue, but this one was used in a few places around our codebase. So the asks here are:

• Can EUI expose the equivalent type for FilterOptionValue?
• Can EUI expose the equivalent type for Filter? Since going through EuiSearchBarProps['filters'] is wrong (we need to add NonNullable too in some cases) and also just annoying