Get page routes from the route index

[caendesilva]

I think there's no point in creating a bunch of new objects each time we want to access a route, however since only pages with actual source files generally get added to the route index, the old behaviour is present as a fall back (for example when using new MarkdownPage in a test)

[caendesilva]

This causes an issue with multiple source files with the same identifier, this is not an issue in actual code as you can't have multiple files with the same name anyways, but in tests where we do everything in-memory it can be an issue as seen here:

develop/packages/framework/tests/Feature/HydePageTest.php

Lines 958 to 962 in a41fa35

	foreach ($pages as $page) {
	$page = new $page('foo');
	$this->assertInstanceOf(Route::class, $page->getRoute());
	$this->assertEquals(new Route($page), $page->getRoute());

[codecov]

Codecov Report

Merging #739 (a9cfc85) into master (698593d) will not change coverage.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##              master      #739   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity      1129      1129           
===========================================
  Files            137       137           
  Lines           2765      2765           
===========================================
  Hits            2765      2765           

Impacted Files	Coverage Δ
packages/framework/src/Pages/Concerns/HydePage.php	100.00% <100.00%> (ø)

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