[Enhancement] Include Chapter and Lesson Details in Search Details

[FahidLatheef]

Currently the Search include Courses, Jobs, Batches.

Chapter and Lesson Search will be a good addition.

Current SQLite Search class can be extended.

[FahidLatheef]

@pateljannat

I can implement this. Need your opinion on some points.

1. What are the items that should be shown for Lessons?

      a) Only Lesson Titles
      
      b) Lesson Titles + Content (Require lesson content parsing)

2. Lesson and Chapter Results may pollute the search results if there are too many occurrences.

      a) Show all results.
      
      b) Keep the Chapter and Lesson search results collapsed by default. And load only when expanded
      
      c) Show first 2 occurrences, collapse the subsequent occurrences by default

3. Search results permission filters. For System Manager, Moderator and Course Creator, everything will be shown. Regarding the LMS Student role, what should be shown?

      a) Show everything
      
      b) Show only enrolled course chapters and course lesson details

If you have any other opinion, let me know.

[pateljannat]

Not sure if we should include lessons in search as the results will get overcrowded. Maybe we can keep this issue open for a while to see if others want this too and then decide on its execution