Add bio field to the Profile struct

[beeman]

• The Profile struct needs an optional bio field (null by default).
• Length of this field should be min 1 and max 256 chars.
• The authorities of the profile should be able to update it using the profile_update instruction
• The behavior should be tested as part of anchor test
• The field should be used in the web ui, like in the PubkeyProtocolUiProfileCard and PubkeyProtocolUiProfileListItem and PubkeyProtocolUiProfileUpdateForm components (possibly in more places)
• The provisionSampleDataProfiles data in the cli needs to add it.

Related #50

[beeman]

Closed by #64