✨(react) add DatePicker component

Based on the Figma DS design by Alex, a mono date-picker
component has been added. It uses react-aria headless ui
component capabilities, with downshift headless ui component.
React-aria was not supporting by default dropdown menus to
select months and years. We could not reuse Popover component
from react-aria because we are not using their headless ui
component for the button one. Clicking on the toggle calendar
button triggers both the button and the popover click outside
events. React-aria button uses a custom onPress props that is
disabled by their popover. Instead, I have implemented a simple
custom hook. This is the first acceptable version of the component.
Some minor user interaction are missing. This first component
doesn't support time selection.

packages/react/src/components/Forms/DatePicker/DateField.tsx

@@ -0,0 +1,88 @@
+import React, { useRef } from "react";
+import {
+  AriaDatePickerProps,
+  useDateField,
+  useDateSegment,
+} from "@react-aria/datepicker";
+import { useLocale } from "@react-aria/i18n";
+import {
+  DateFieldState,
+  useDateFieldState,
+  DateSegment,
+} from "@react-stately/datepicker";
+import { createCalendar, DateValue } from "@internationalized/date";
+import classNames from "classnames";
+import { Button } from ":/components/Button";
+import { useCunningham } from ":/components/Provider";
+
+interface DateSegmentProps {
+  currentSegment: DateSegment;
+  previousSegment: DateSegment;
+  state: DateFieldState;
+}
+
+export const DateSegmentInput = ({
+  currentSegment,
+  previousSegment,
+  state,
+}: DateSegmentProps) => {
+  const ref = useRef<HTMLDivElement>(null);
+  const { segmentProps } = useDateSegment(currentSegment, state, ref);
+  return (
+    <div
+      ref={ref}
+      {...segmentProps}
+      className={classNames("c__date-picker__inner__value__segment", {
+        "c__date-picker__inner__value__segment--empty":
+          currentSegment.isPlaceholder ||
+          (currentSegment.type === "literal" && previousSegment?.isPlaceholder),
+      })}
+    >
+      {currentSegment.text}
+    </div>
+  );
+};
+
+export const DateField = (props: AriaDatePickerProps<DateValue>) => {
+  const { locale } = useLocale();
+  const state = useDateFieldState({
+    ...props,
+    locale,
+    createCalendar,
+  });
+  const ref = useRef<HTMLDivElement>(null);
+  const { fieldProps } = useDateField(props, state, ref);
+  const { t } = useCunningham();
+
+  return (
+    <>
+      <div className="c__date-picker__inner__value" {...fieldProps} ref={ref}>
+        {state.segments.map((segment, i, segments) => (
+          <DateSegmentInput
+            key={i}
+            currentSegment={segment}
+            previousSegment={segments[i - 1]}
+            state={state}
+          />
+        ))}
+      </div>
+      {!props.isDisabled && (
+        <Button
+          className={classNames("c__date-picker__inner__action", {
+            "c__date-picker__inner__action--empty": !state.value,
+          })}
+          color="tertiary"
+          size="small"
+          icon={<span className="material-icons">cancel</span>}
+          onClick={() => {
+            // "era" option doesn't clear partially filled dataField.
+            state.clearSegment("day");
+            state.clearSegment("month");
+            state.clearSegment("year");
+          }}
+          aria-label={t("components.forms.date_picker.clear_button_aria_label")}
+        />
+      )}
+    </>
+  );
+};