testing/main: move testing CLI from example to lib binary

Euxanerequested to merge
topic/default/cli_bin into branch/default

This moves the testing CLI entry point from the Cargo examples to a binary hidden behind the "cli" feature flag.

This will allow other test binaries (such as the analytics entry point) to reuse the CLI-related graph IO functions more easily.

Requires !13 (merged).

Edited by Euxane

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