Deprecate DiscoveryService.php

[caendesilva]

The Discovery Service (previously called BuildService) provides helper methods for source file autodiscovery used in the building process to determine where files are located and how to parse them.

Autodiscovery is now powered by the Router. The helpers here can be moved to FluentPathHelpers.php

[codecov]

Codecov Report

Merging #208 (cccb36e) into master (1987d43) will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff             @@
##              master      #208   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity       809       809           
===========================================
  Files            103       103           
  Lines           2075      2075           
===========================================
  Hits            2075      2075           

Impacted Files	Coverage Δ
...ckages/framework/src/Services/DiscoveryService.php	100.00% <ø> (ø)

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