Fix the HttpRouter problem with overlapping in trail and the middle of routes

[Vkt0r]

This PR should fix #378, #381 and #376 and can be resumed in the following steps:

• Remove the set of the empty string for not matched parameters, by default should be nil
• Add unit tests to verify the trail dynamic identifier as the end of the route and with more dynamic path after the end of the route and the overlapping during the middle of the route

The findHandler method was refactored to fix two main issues occurring during the search of a route.

1. Nodes ending in dynamic trails were not matched correctly if they have more routes after the trail. Examples of routes are defined in the new test case testHttpRouterShouldHandleOverlappingRoutesInTrail added.
2. After the search traverse an incorrect path in a dynamic route the recursion was not handling the rest of the case properly regarding the IndexingIterator<[String] is mutated after call next().

The method was refactored to use a default array with indexes instead of the IndexingIterator<[String] to be able to traverse the routes and search correctly and removed the part of the code causing the routes with a dynamic trail were not matched.

[Vkt0r]

I tried this fix in a big suite of UI Tests with a lot of overlapping in the routes as it's working as expected. Also, we have positive answers about the fix of the issue in #381 and #376. So this PR is ready to be reviewed 🚀.

[adamkaplan]

Merge if you like, just one minor comment about the docs, otherwise looks good

[Vkt0r]

Thanks, @adamkaplan and welcome back 😀.