[Example App] Start & stop network follower

• Display network follower status in the example app.
• Start & stop network follower in the example app.
• Present error when starting or stopping network follower fails.

requested review from @ahmedshehata01

assigned to @darrarski.xx

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mentioned in merge request !11 (merged)

mentioned in merge request !12 (merged)

added 8 commits

• 8ab5b3b5...b5ffe08c - 7 commits from branch main
• 76cfe063 - Merge branch 'main' into feature/example-start-stop-network-follower

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mentioned in merge request !14 (merged)

mentioned in commit f02f3d7a

merged