feat(elements): Add active session selection [SDKI-290]

[tmilewski]

Description

Introduce multi-session choose account step and associated actions/components.

Example:

<SignIn.Step name='choose-session'>
  <SignIn.SessionList>
    <SignIn.SessionListItem>
      {({ session }) => <>{session.identifier} | <SignIn.Action setActiveSession>Switch...</SignIn.Action></>}
    </SignIn.SessionListItem>
  </SignIn.SessionList>
</SignIn.Step>

By default, SessionList does not include the current session. Adding includeCurrentSession to SignIn.SessionList will include it.

Fixes SDKI-290

Checklist

• npm test runs as expected.
• npm run build runs as expected.
• (If applicable) JSDoc comments have been added or updated for any package exports
• (If applicable) Documentation has been updated

Type of change

• 🐛 Bug fix
• 🌟 New feature
• 🔨 Breaking change
• 📖 Refactoring / dependency upgrade / documentation
• other:

[changeset-bot]

🦋 Changeset detected

Latest commit: fc7bd76

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@clerk/elements	Minor

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[alexcarpenter]

Works beautifully 👏🏼 #3973