Add support for json-field snippet generation

[k-yomo]

Resolves #1431

[codecov-commenter]

Codecov Report

Merging #1434 (50d0840) into main (fcc7bd7) will increase coverage by 0.02%. The diff coverage is 88.33%.

@@            Coverage Diff             @@
##             main    #1434      +/-   ##
==========================================
+ Coverage   94.24%   94.27%   +0.02%     
==========================================
  Files         237      237              
  Lines       44239    44298      +59     
==========================================
+ Hits        41693    41761      +68     
+ Misses       2546     2537       -9     

Impacted Files	Coverage Δ
src/schema/term.rs	84.92% <64.28%> (-0.74%)	:arrow_down:
src/snippet/mod.rs	95.34% <95.65%> (+2.36%)	:arrow_up:
src/core/index.rs	92.79% <0.00%> (+0.18%)	:arrow_up:
bitpacker/src/bitpacker.rs	97.02% <0.00%> (+0.99%)	:arrow_up:
src/postings/per_field_postings_writer.rs	97.05% <0.00%> (+2.94%)	:arrow_up:
src/schema/json_object_options.rs	92.85% <0.00%> (+7.14%)	:arrow_up:

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.