added enter key functionality

CHANGELOG.md

@@ -1,5 +1,6 @@
 ## [`master`](https://github.com/elastic/eui/tree/master)
 
+- Added `Enter` key press functionality to `EuiSuperDatePicker` ([#3048](https://github.com/elastic/eui/pull/3048))
 - Exported `dateFormatAliases` as a part of the public API ([#3043](https://github.com/elastic/eui/pull/3043))
 - Exported `EuiTextProps` type definition ([#3039](https://github.com/elastic/eui/pull/3039))
 - Removed `role` attribute from `EuiImage`([#3036](https://github.com/elastic/eui/pull/3036))

src/components/date_picker/super_date_picker/__snapshots__/super_date_picker.test.js.snap

@@ -4,6 +4,7 @@ exports[`EuiSuperDatePicker is rendered 1`] = `
 <EuiFlexGroup
   className="euiSuperDatePicker__flexWrapper"
   gutterSize="s"
+  onKeyPress={[Function]}
   responsive={false}
 >
   <EuiFlexItem>

src/components/date_picker/super_date_picker/super_date_picker.js

@@ -312,6 +312,7 @@ export class EuiSuperDatePicker extends Component {
           isCustom
           startDateControl={<div />}
           endDateControl={<div />}
+          onKeyPress={this.handleKeyPress}
           readOnly>
           <span className="euiSuperDatePicker__prettyFormat">
             {prettyInterval(this.props.isPaused, this.props.refreshInterval)}
@@ -412,6 +413,12 @@ export class EuiSuperDatePicker extends Component {
     }
   };
 
+  handleKeyPress = event => {
+    if (event.key === 'Enter') {
+      this.handleClickUpdateButton();
+    }
+  };
+
   renderUpdateButton = () => {
     if (!this.props.showUpdateButton || this.props.isAutoRefreshOnly) {
       return;
@@ -461,6 +468,7 @@ export class EuiSuperDatePicker extends Component {
       <EuiFlexGroup
         gutterSize="s"
         responsive={false}
+        onKeyPress={this.handleKeyPress}
         className={flexWrapperClasses}>
         <EuiFlexItem>
           <EuiFormControlLayout