Rename build hooks to build tasks

[caendesilva]

Refactors the build hook service and renames it to build task service as we are dealing with tasks and not hooks. This makes it more consistent. The hook part is just that the tasks are automatically run in the build process.

[codecov]

Codecov Report

Merging #459 (8e697e4) into master (043405e) will not change coverage.
The diff coverage is 100.00%.

❗ Current head 8e697e4 differs from pull request most recent head 2ec5357. Consider uploading reports for the commit 2ec5357 to get more accurate results

@@            Coverage Diff            @@
##             master     #459   +/-   ##
=========================================
  Coverage     99.60%   99.60%           
  Complexity      923      923           
=========================================
  Files           109      109           
  Lines          2281     2281           
=========================================
  Hits           2272     2272           
  Misses            9        9           

Impacted Files	Coverage Δ
...ages/framework/src/Contracts/AbstractBuildTask.php	100.00% <ø> (ø)
...ckages/framework/src/Services/BuildTaskService.php	100.00% <ø> (ø)
...mework/src/Commands/HydeBuildStaticSiteCommand.php	100.00% <100.00%> (ø)

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