Convert GeneratesDocumentationSearchIndex Action into Service

[caendesilva]

Original comment:

Convert into Service, and add more strategies, such as slug-only (no file parsing)
which while dumber, would be much faster to compile and take way less space.

See #435

Three main tasks to this

• Convert GeneratesDocumentationSearchIndex Action into Service
• Add more strategies, such as slug-only (no file parsing)
• Use service to house the logic for the full page search file

The action is marked as internal and is not covered by semantic versioning.

[codecov]

Codecov Report

Merging #457 (0d31143) into master (788a271) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master     #457   +/-   ##
=========================================
  Coverage     99.60%   99.60%           
- Complexity      919      921    +2     
=========================================
  Files           109      109           
  Lines          2269     2273    +4     
=========================================
+ Hits           2260     2264    +4     
  Misses            9        9           

Impacted Files	Coverage Δ
packages/framework/src/StaticPageBuilder.php	100.00% <ø> (ø)
...work/src/Actions/PostBuildTasks/GenerateSearch.php	100.00% <100.00%> (ø)
...ages/framework/src/Contracts/AbstractBuildTask.php	100.00% <100.00%> (ø)
...mework/src/Services/DocumentationSearchService.php	100.00% <100.00%> (ø)

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