Deprecate unnecessary contracts

[caendesilva]

These were originally added because I wrongly assumed the Laravel service container only accepted interfaces when type hinting. These classes aren't intended to be extended in the same ways other contracts are. Thus, having interfaces for these adds undue complexity.

The following interfaces are affected:

• HydeKernelContract, type hint the HydeKernel::class instead
• AssetServiceContract, type hint the AssetService::class instead

[codecov]

Codecov Report

Merging #428 (7022fc7) into master (d730d68) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master     #428   +/-   ##
=========================================
  Coverage     99.95%   99.95%           
  Complexity      915      915           
=========================================
  Files           102      102           
  Lines          2259     2259           
=========================================
  Hits           2258     2258           
  Misses            1        1           

Impacted Files	Coverage Δ
packages/framework/src/Hyde.php	100.00% <ø> (ø)
packages/framework/src/Facades/Asset.php	100.00% <100.00%> (ø)
.../framework/src/Foundation/BaseSystemCollection.php	100.00% <100.00%> (ø)
packages/framework/src/Foundation/Filesystem.php	100.00% <100.00%> (ø)
packages/framework/src/HydeKernel.php	100.00% <100.00%> (ø)
packages/framework/src/HydeServiceProvider.php	100.00% <100.00%> (ø)
packages/framework/src/helpers.php	100.00% <100.00%> (ø)

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