Add new URL path helpers

[caendesilva]

Having a function that can return both a string and a psuedo-boolean (false) can lead to unpredictable states. This PR deprecates the Hyde::uriPath() helper and adds two new ones instead, Hyde::qualifiedUrl() and Hyde::hasSiteUrl(), effectively splitting the former into the latter.

[codecov]

Codecov Report

Merging #292 (6570ef9) into master (55b4f98) will not change coverage.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##              master      #292   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
- Complexity       809       813    +4     
===========================================
  Files             96        96           
  Lines           2025      2033    +8     
===========================================
+ Hits            2025      2033    +8     

Impacted Files	Coverage Δ
packages/framework/src/Hyde.php	100.00% <ø> (ø)
...framework/src/Commands/HydeBuildSitemapCommand.php	100.00% <100.00%> (ø)
...s/framework/src/Concerns/GeneratesPageMetadata.php	100.00% <100.00%> (ø)
...ackages/framework/src/Concerns/HasPageMetadata.php	100.00% <100.00%> (ø)
packages/framework/src/HydeKernel.php	100.00% <100.00%> (ø)
...ckages/framework/src/Models/Pages/MarkdownPost.php	100.00% <100.00%> (ø)
packages/framework/src/Models/Route.php	100.00% <100.00%> (ø)
packages/framework/src/Services/RssFeedService.php	100.00% <100.00%> (ø)
packages/framework/src/Services/SitemapService.php	100.00% <100.00%> (ø)
...kages/framework/src/Services/ValidationService.php	100.00% <100.00%> (ø)

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[caendesilva]

Since the refactor to fully use the new helper will involve the article views I first want to add tests for those.

Edit: Done.