Add input-compatible props to select-like elements and DatePicker

[yhatt]

Added props of <Input> to select-like elements and <DatePicker>, and wrap in <Input> automatically when using these. It allows HTML form style templating.

By this implementation, JSX for outdated dialog (@speee-js/jsx-slack/dialog) can migrate into modal with minimum changes in template.

<Dialog callbackId="createUser" title="Create user">
  <UsersSelect name="user" label="User" required />
  <Select name="role" label="Role" value="regular" required>
    <Option value="regular">Regular</Option>
    <Option value="leader">Leader</Option>
    <Option value="admin">Admin</Option>
  </Select>
</Dialog>

In this case, just change from Dialog to Modal.

<Modal callbackId="createUser" title="Create user">
  <UsersSelect name="user" label="User" required />
  <Select name="role" label="Role" value="regular" required>
    <Option value="regular">Regular</Option>
    <Option value="leader">Leader</Option>
    <Option value="admin">Admin</Option>
  </Select>
</Modal>