CLI: Add optional airdrop recipient (#8291)

* CLI: Add optional airdrop recipient

* Update book usage page

cli/tests/deploy.rs

@@ -42,6 +42,7 @@ fn test_cli_deploy_program() {
     config.command = CliCommand::Airdrop {
         faucet_host: None,
         faucet_port: faucet_addr.port(),
+        pubkey: None,
         lamports: minimum_balance_for_rent_exemption + 1, // min balance for rent exemption + leftover for tx processing
     };
     process_command(&config).unwrap();

cli/tests/request_airdrop.rs

@@ -18,6 +18,7 @@ fn test_cli_request_airdrop() {
     bob_config.command = CliCommand::Airdrop {
         faucet_host: None,
         faucet_port: faucet_addr.port(),
+        pubkey: None,
         lamports: 50,
     };