Rework send membership and identity documents examples

Moulrequested to merge
rework_send_membership_identity_documents into dev
  • [enh] Improve send_identity.py example
    • Pass the key to get_identity_document()
    • Rename the file to send_identity for consistency with the other files
  • [enh] Improve send_membership.py example
    • Remove the useless Identity document generation
    • Pass the key to get_membership_document()
    • Get the uid and the timestamp from the identity get from /wot/lookup
  • [mod] Improve bma imports in send_*.py examples

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