Add TaskMessageBuilder to change what is shown in the list

[tahirmt]

• Introduce a way to customize the look of the list.
• TaskMessageBuilder is a protocol that takes a NetworkTaskEntity and returns a view.
• The default implementation is unchanged where it displays a Text with the url only
• This can be used to customize what else gets displayed since the entire task is available.

[kean]

Hey, @tahirmt. Thanks for kicking this off. I was planning to add customization options for the list. My initial plan was to add a few customization options that you could either set using UserDefaults (programmatically) or via the Settings screen.

[tahirmt]

@kean my use case for this so far is that I want to show values for certain headers in the main list. For example if you've used Apollo GraphQL iOS it adds some headers that can let you identify operation name etc so having that on the list is super helpful.

[theo-brlle]

Hey @kean, I'm also interested in a feature to customize the rows in the list in order to easily detect GraphQL queries / mutations. Do you consider merging this PR for 4.0.0? 🤔
Thanks in advance! 🙏

[kean]

Hey, @theo-brlle. I'm not entirely sure because allowing the users to completely replace the cells is probably not something I would want to expose in the public API.

In Pulse for Mac, there is going to be an option to add table columns displaying any of the predefined HTTP header values. It may be worth adding something like that to the list as well.

[tahirmt]

This is no longer necessary with support to show headers in the list. #196