Make Faraday::Request serialisable with Marshal.

[michielboekhoff]

Description

This partially aids #535, or rather the over-arching need for serialisation of Faraday::Request. I didn't include any JSON serialisation in this on purpose, as I believe it needs more discussion.

[iMacTia]

Thanks @michielboekhoff for taking a shot at this.
No worries for JSON support, we can do one thing at a time 👍
Could you just please rename the existing test_marshal into test_marshal_response for consistency?

[michielboekhoff]

Thanks for the quick reply, @iMacTia. I've changed the test name to test_marshal_response. Concerning JSON serialisation, could we have a chat about that in #535?

[iMacTia]

@michielboekhoff thanks, merged 👍
And yes we can talk in #535 about JSON serialisation, although I doubt we can do something reversible like YAML and Marshal. I'd also like to understand the use-case for that before reviewing an implementation

[AgentAntelope]

Thanks very much for this 👍