support "application/x-www-form-urlencoded"

[jossef]

Add application/x-www-form-urlencoded encoding support in put and post methods for requests having Map object as body.

Add bodyEncoding to the method signature. the default should be BodyEncoding.JSON if not specified

dynamic body = await Requests.post("https://mydomain.com/api/v1/foo", json: true, body: {"foo":"bar"}, 
bodyEncoding: BodyEncoding.FormURLEncoded);

[genesiscz]

I would create a pull request if we agreed on the way this should work, and as I said earlier, I believe it should work, by default, the way http package does. BodyEncoding.JSON should be a configurable, but not default.

[jossef]

I would create a pull request if we agreed on the way this should work, and as I said earlier, I believe it should work, by default, the way http package does. BodyEncoding.JSON should be a configurable, but not default.

@genesiscz okay, let's default it to BodyEncoding.FormURLEncoded

[genesiscz]

I hadn't had enough time to do this properly as it would be my first open source work, if anyone other feels like helping here, feel free to. I may look at it in some free time.

[genesiscz]

Opened a pull request #6

[genesiscz]

Can this have some attention, please?

[jossef]

@genesiscz, thanks for the PR!
Will merge and publish a release this weekend