Feature/47 cookie support

[robin-schoch]

Hi,

This PR partially addresses cookie handling. It includes:

• Parsing cookies from incoming requests
• Parsing cookies from server responses
• Creating new cookies on the server side

However, the following cookie-related tasks are not implemented:

• Implementing client-side cookie storage
• Attaching matching cookies to outgoing client requests
• Sanitizing cookie values

Known issues with the current implementation:

• Timezone defaults to GMT without properly accounting for the delta
• Some default values, like domain, are not correctly set when reading cookies on the client (currently defaults to None)
• I’m fairly new to Mojo, so this code might not be effective mojo

[saviorand]

Hi, thanks, looks great! Will review in more detail over the weekend.