[mod] #160: Define functions in examples

examples/create_public_key.py

examples/listen_ws2p.py

examples/load_binary_encrypted_message.py

examples/load_binary_signed_message.py

examples/load_cleartext_ascii_armor_message.py

examples/load_credentials_file.py

examples/load_encrypted_ascii_armor_message.py

examples/load_local_blockchain.py

examples/load_scuttlebutt_file.py

examples/request_available_nodes.py

examples/request_data.py

examples/request_data_async.py

examples/request_data_elasticsearch.py

examples/request_data_graphql.py

examples/request_web_socket_block.py

examples/request_ws2p.py

examples/save_and_load_private_key_file.py

examples/save_and_load_private_key_file_ewif.py

examples/save_and_load_private_key_file_pubsec.py

examples/save_and_load_private_key_file_wif.py