[WIP] Db async

[calvogenerico]

I'll explain all the changes with more detail in the readme. Right now this is just to show the changes.

[codecov]

Codecov Report

Merging #21 (64065ac) into master (774833d) will increase coverage by 2.94%.
The diff coverage is 86.38%.

@@            Coverage Diff             @@
##           master      #21      +/-   ##
==========================================
+ Coverage   84.68%   87.62%   +2.94%     
==========================================
  Files           9       18       +9     
  Lines         973     1261     +288     
==========================================
+ Hits          824     1105     +281     
- Misses        149      156       +7     

Impacted Files	Coverage Δ
src/downloader.js	66.00% <66.66%> (-8.00%)	⬇️
src/http/build-main-server.js	67.56% <67.56%> (ø)
src/crawler.js	95.83% <75.00%> (ø)
src/database.js	82.90% <76.04%> (-3.98%)	⬇️
src/indexer.js	87.61% <83.33%> (-3.48%)	⬇️
src/data-sources/sqlite-datasource.js	89.66% <89.66%> (ø)
src/config.js	93.93% <90.47%> (-6.07%)	⬇️
src/trust-list/db-trust-list.js	95.00% <95.00%> (ø)
src/http/build-execution-server.js	95.55% <95.55%> (ø)
src/http/api-server.js	98.03% <98.03%> (ø)
... and 12 more

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