refactor(framework) Order CLI args alphabetically

[chongshenng]

Sets the help output in flower-superlink, flower-supernode, flwr-serverapp, and flwr-clientapp to be alphabetical. This improves readability.

Example before

➜ flower-supernode -h
usage: flower-supernode [-h] [--insecure] [--grpc-rere | --grpc-adapter | --rest] [--root-certificates ROOT_CERT] [--superlink SUPERLINK] [--max-retries MAX_RETRIES]
                        [--max-wait-time MAX_WAIT_TIME] [--auth-supernode-private-key AUTH_SUPERNODE_PRIVATE_KEY]
                        [--auth-supernode-public-key AUTH_SUPERNODE_PUBLIC_KEY] [--node-config NODE_CONFIG] [--flwr-dir FLWR_DIR] [--isolation {subprocess,process}]
                        [--clientappio-api-address CLIENTAPPIO_API_ADDRESS]

Start a Flower SuperNode

options:
  -h, --help            show this help message and exit
  --insecure            Run the client without HTTPS. By default, the client runs with HTTPS enabled. Use this flag only if you understand the risks.
  --grpc-rere           Use grpc-rere as a transport layer for the client.
  --grpc-adapter        Use grpc-adapter as a transport layer for the client.
  --rest                Use REST as a transport layer for the client.
...

Example after

➜ flower-supernode -h
usage: flower-supernode [--auth-supernode-private-key AUTH_SUPERNODE_PRIVATE_KEY] [--auth-supernode-public-key AUTH_SUPERNODE_PUBLIC_KEY]
                        [--clientappio-api-address CLIENTAPPIO_API_ADDRESS] [--flwr-dir FLWR_DIR] [-h] [--insecure] [--isolation {subprocess,process}]
                        [--max-retries MAX_RETRIES] [--max-wait-time MAX_WAIT_TIME] [--node-config NODE_CONFIG] [--root-certificates ROOT_CERT] [--superlink SUPERLINK]
                        [--grpc-rere | --grpc-adapter | --rest]

Start a Flower SuperNode

options:
  --auth-supernode-private-key AUTH_SUPERNODE_PRIVATE_KEY
                        The SuperNode's private key (as a path str) to enable authentication.
  --auth-supernode-public-key AUTH_SUPERNODE_PUBLIC_KEY
                        The SuperNode's public key (as a path str) to enable authentication.
  --clientappio-api-address CLIENTAPPIO_API_ADDRESS
                        ClientAppIo API (gRPC) server address (IPv4, IPv6, or a domain name). By default, it is set to 0.0.0.0:9094.
  --flwr-dir FLWR_DIR   The path containing installed Flower Apps. The default directory is: - `$FLWR_HOME/` if `$FLWR_HOME` is defined - `$XDG_DATA_HOME/.flwr/` if
                        `$XDG_DATA_HOME` is defined - `$HOME/.flwr/` in all other cases
  -h, --help            show this help message and exit
  --insecure            Run the client without HTTPS. By default, the client runs with HTTPS enabled. Use this flag only if you understand the risks.
...