feat: deprecate getHostname

[sehnryr]

Proposed changes

Changed the hostname parameter of the cookie management methods by the corresponding url. This will allow a better readability and a better use of these methods.

var hostname = getHostname(url);
Requests.clearStoredCookies(hostname);
Requests.setStoredCookies(hostname, cookies);
Requests.getStoredCookies(hostname);
Requests.addCookie(hostname, name, value);

To:

Requests.clearStoredCookies(url);
Requests.setStoredCookies(url, cookies);
Requests.getStoredCookies(url);
Requests.addCookie(url, name, value);

This was discussed there #76 (comment) and to explain quickly here, getHostname(url) isn't really needed and complexify the use of the other methods unnecessarily.

Type of changes

What types of changes does your code introduce?

Put an x in the boxes that apply.

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

• I have read the CONTRIBUTING doc
• My code follows the Dart coding convention
• Lint and unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works.
• I have commented my code, particularly in hard-to-understand areas
• I have added necessary documentation (if appropriate)

Further comments

It would be nice to be able to pass either the url or the hostname in the methods.