fix(types): export missing types (#283)

Some consumers in Kibana needs this exported types. They are getting the types from the dist folder.
To avoid that I've exported those required types from the main index.ts file

src/index.ts

@@ -1,9 +1,9 @@
 export * from './specs';
 export { Chart } from './components/chart';
 export { TooltipType, TooltipValue, TooltipValueFormatter } from './chart_types/xy_chart/utils/interactions';
-export { getAxisId, getGroupId, getSpecId, getAnnotationId } from './utils/ids';
+export { SpecId, GroupId, AxisId, AnnotationId, getAxisId, getGroupId, getSpecId, getAnnotationId } from './utils/ids';
 export { ScaleType } from './utils/scales/scales';
-export { Position, Rendering, Rotation } from './chart_types/xy_chart/utils/specs';
+export { Position, Rendering, Rotation, TickFormatter } from './chart_types/xy_chart/utils/specs';
 export * from './utils/themes/theme';
 export { LIGHT_THEME } from './utils/themes/light_theme';
 export { DARK_THEME } from './utils/themes/dark_theme';
@@ -26,3 +26,10 @@ export {
 } from './chart_types/xy_chart/utils/specs';
 export { GeometryValue } from './chart_types/xy_chart/rendering/rendering';
 export { AnnotationTooltipFormatter } from './chart_types/xy_chart/annotations/annotation_utils';
+export { SettingSpecProps } from './specs/settings';
+export {
+  BrushEndListener,
+  ElementClickListener,
+  ElementOverListener,
+  LegendItemListener,
+} from './chart_types/xy_chart/store/chart_state';