[go_router] Add routing functions to GoRouteData

[StevenSorial]

second step of fixing #106790. First PR

This PR adds the routing methods .location, .go(context), .push(context), .pushReplacement(context), and replace(context) to GoRouteData. They will be overridden by the mixin generated by go_router_builder

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[StevenSorial]

@hannah-hyj

[chunhtai]

LGTM

[chunhtai]

Suggested change

	'It should throw beacuase there is not code generated',
	'It should throw beacuase there is no code generated',

[StevenSorial]

@chunhtai @hannah-hyj Thanks for the approval. There are two things that I would appreciate some help with in this PR:

• Currently if the user installed go_router >= 15.2.0, but go_router_builder < 3.0.0, the exception would be thrown on navigation. Is there a way to describe this dependency?
• I don't like how the test I wrote looks 😅 Is there a way to improve it?