Add ability to override default route configuration

[Blackbaud-PatrickOFriel]

When we generate routes based on the file system we need to allow the consumer to specify overrides for the generated route, such as canActivateRoute and canActivateChild which will be SPA-specific.

From blackbaud/skyux-cli#5

[blackbaud-brandonstirnaman]

I'll be taking a stab at this in the next day or so.

[Blackbaud-PaulCrowder]

Some thoughts on a possible implementation:

• Just like we detect an index.html in the folder to create the route, we could detect an index-guard.service.ts file.
• We import this file, extract the class name, and add it to the route's canActivate property when we define the route.

[blackbaud-brandonstirnaman]

I feel like index.guard.ts would be a better naming convention but generally agree on that implementation.

[Blackbaud-PaulCrowder]

That was my initial thought as well, but I noticed in the Angular docs they used the name auth-guard.service.ts. There's no mention of route guard naming conventions in their style guide, though, so I'd be fine with index.guard.ts.

[blackbaud-brandonstirnaman]

This is now available in builder 1.0.0-beta.31 for canActivate/canDeactivate.