feat(PageHeader): add PageHeader component

[akdetrick]

Closes NDS-520

Adds PageHeader component. See storybook preview commented below for design review and docs.

[akdetrick]

Design notes

• Support truncation in breadcrumbs
  • Consider PageHeader.Crumb interface of children
• Check if we can include chevrons inside row items for breadcrumbs, so they always come after the label

Example breadcrumbs

"Checking > Account Name could be really long and we would prefer truncation"

[akdetrick]

Proposed interface change

Per design feedback, we will need to individually control truncation behavior of breadcrumbs. This interface would also prevent the duck typing we're doing with the array-like interface

<PageHeader kind="compact">
   <PageHeader.BackLink label="string" onClick={() => {}} />
   <PageHeader.Breadcrumbs>
      <PageHeader.Crumb label="Breadcrumb link" onClick={() => {}} />
      <PageHeader.Crumb label="Long account name that we need to truncate" truncate />
      <PageHeader.Crumb label="Current page" />
   </PageHeader.Breadcrumbs>
   <PageHeader.Menu>
      <MenuButton>...</MenuButton>
   </PageHeader.Menu>
   <PageHeader.Actions>
      <Button kind="secondary" label="action 1" />
      <Button kind="primary" label="action 2" />
   </PageHeader.Actions>
</PageHeader>

[github-actions[bot]]

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[github-actions[bot]]

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