Add CLI integration tests for makerd/cli, directoryd/cli, and taker-cli apps

[vs4vijay]

Related to #194

Add integration tests for makerd/cli, directoryd/cli, and taker-cli apps using std::process::Command.

• New Integration Tests

  • Add tests/cli_integration_tests.rs to include integration tests for makerd/cli, directoryd/cli, and taker-cli apps.
  • Use std::process::Command to call the CLI apps with various commands and arguments.
  • Assert the returned results to ensure the CLI apps work as expected.

• Helper Functions

  • Add helper functions in tests/test_framework/mod.rs for starting and stopping the directory server, maker server, and taker client using std::process::Command.

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[vs4vijay]

meant to raise PR on forked repo, not the main one. Closing this one for now.