Add openAPI schema generation and a CLI using progenitor

[kervel]

• add an openAPI schema generation using utoipa
• then use that openAPI schema to create a CLI tool (in rust) using progenitor

problem however is that utoipa is generating openAPI 3.1 and progenitor is consuming openAPI 3.0 so i had to hack my way around this.

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[kervel]

hello @AbianS ... i'm a bit stuck here. i can finish this but i'm not sure its the right approach (see my remark). there are alternative approaches for going to a CLI:

• not using progenitor (just handroll a CLI)
• use another openAPI 3.1 compliant code gen (but i didn't really find a good rust-native one)

i'm eager to know your opinion before continuing here ..