Add parameter for filtering key terms by book/chapters

[Enkidu93]

Addresses sillsdev/serval#476

Supports sillsdev/serval#508

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This change is 

[johnml1135]

src/SIL.Machine/Corpora/ParatextProjectTermsParserBase.cs line 200 at r1 (raw file):

                    && verseRefs.Any(vr =>
                        chapters.TryGetValue(vr.Book, out HashSet<int> bookChapters)
                        && (bookChapters.Count() == 0 || bookChapters.Contains(vr.ChapterNum))

Where are the tests for this?

[johnml1135]

Reviewed 2 of 3 files at r1, all commit messages.
Reviewable status: 2 of 3 files reviewed, all discussions resolved (waiting on @ddaspit)

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 88.57143% with 4 lines in your changes missing coverage. Please review.

Project coverage is 69.90%. Comparing base (3616630) to head (ff75f8d).

Files with missing lines	Patch %	Lines
....Machine/Corpora/ParatextProjectTermsParserBase.cs	87.50%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #256      +/-   ##
==========================================
+ Coverage   69.88%   69.90%   +0.01%     
==========================================
  Files         379      379              
  Lines       31732    31765      +33     
  Branches     4450     4453       +3     
==========================================
+ Hits        22175    22204      +29     
- Misses       8525     8527       +2     
- Partials     1032     1034       +2     

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[johnml1135]

Reviewed 1 of 3 files at r1.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @ddaspit)