Add SameSite support for NancyCookies

[0x414c49]

Prerequisites

• [x] I have written a descriptive pull-request title
• [x] I have verified that there are no overlapping pull-requests open
• [x] I have verified that I am following the Nancy code style guidelines
• [x] I have provided test coverage for my change (where applicable)

Description

Nancy Cookies doesn't support SameSite property. This PR adds SameSite property to cookies. The possible values for SameSite property are defined by an enum SameSite.cs: Lax, Strict and None.

This change won't break anything, all cookies work as they suppose to work. All the tests are passed and two new tests added to cover the new functionality.

Fix #3002

[drewfreyling]

Nice work on the pr. I think setting the secure value to true automatically isn't the right approach. That should be user set. Not all browsers are doing the none+secure thing. Even if they were it makes the code more obvious if the user is setting it themselves.

[0x414c49]

Nice work on the pr. I think setting the secure value to true automatically isn't the right approach. That should be user set. Not all browsers are doing the none+secure thing. Even if they were it makes the code more obvious if the user is setting it themselves.

Kinda agree with you. I will change to codes and push them.