Rebuilding indexes done on separate thread, only once #616 #615

[joepio]

PR Checklist:

• Link to related issues: closes build_index run twice on atomic-server boot #616 closes Rebuild index async on boot #615
• Add changelog entry linking to issue, describe API changes
• Add tests (optional)
• (If new feature) add to description / readme

[codecov-commenter]

Codecov Report

Merging #617 (3e9df53) into develop (c849fa7) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

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@@             Coverage Diff             @@
##           develop     #617      +/-   ##
===========================================
- Coverage    65.48%   65.47%   -0.01%     
===========================================
  Files           72       72              
  Lines         8037     8026      -11     
===========================================
- Hits          5263     5255       -8     
+ Misses        2774     2771       -3     

Impacted Files	Coverage Δ
lib/src/db/test.rs	95.39% <ø> (-0.03%)	⬇️
server/src/serve.rs	0.00% <ø> (ø)
server/src/tests.rs	95.23% <ø> (ø)
lib/src/db.rs	54.87% <100.00%> (-3.55%)	⬇️
lib/src/db/prop_val_sub_index.rs	100.00% <100.00%> (ø)
lib/src/db/val_prop_sub_index.rs	93.33% <100.00%> (-0.61%)	⬇️
lib/src/parse.rs	79.47% <100.00%> (+0.32%)	⬆️
lib/src/populate.rs	99.17% <100.00%> (+0.04%)	⬆️
lib/src/storelike.rs	76.44% <100.00%> (+0.22%)	⬆️
server/src/appstate.rs	84.93% <100.00%> (+0.53%)	⬆️

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