[Feature request] Add DateParseHandling.None to RestRequest

[HiQ-wipa]

As discussed at JamesNK/Newtonsoft.Json#862, Newtonsoft.Json likes to reinterpret date strings, which often causes nasty surprises with Frends.Web.RestRequest.

I think the RestRequest task should have a new option, e.g. "Disable date parsing", which would disable this behaviour.

In practice, I think this option needs to be passed to TryParseRequestStringResultAsJToken, which would use JsonConvert.DeserializeObject with appropriate parsing options if this option is set.