Add Hookdeck CLI

[leggetter]

The Hookdeck platform is closed-source and has a free tier, but it is ultimately commercial.

The Hookdeck CLI works with the commercial offering but also allows anonymous connectivity without a Hookdeck account.

[anderspitman]

Hey @leggetter, sorry for the delay. Does Hookdeck work with arbitrary HTTP traffic, or just webhooks, ie can I run a webserver behind it?

Don't worry about the conflicts, I'll fix those if we end up merging.

[leggetter]

@anderspitman - yes, full pass-through support. Something I should flag - and happy to update the text description - is that because Hookdeck is purely asynchronous, the server response is not returned to the client that initiates the request. The initiating client will instead get a 200 OK for all valid requests, acknowledging that the request has been received.

[leggetter]

@anderspitman - yes, full pass-through support. Something I should flag - and happy to update the text description - is that because Hookdeck is purely asynchronous, the server response is not returned to the client that initiates the request. The initiating client will instead get a 200 OK for all valid requests, acknowledging that the request has been received.

The text does say "asynchronous", but I want to make sure the above is clear.