feat: use openssl for tls connections, add CA_ROOT_FILE support

[stepankuzmin]

Closes #63
Closes #95

[codecov]

Codecov Report

Merging #268 (de5a09f) into master (d4d101c) will increase coverage by 0.45%.
The diff coverage is 40.90%.

@@            Coverage Diff             @@
##           master     #268      +/-   ##
==========================================
+ Coverage   52.13%   52.59%   +0.45%     
==========================================
  Files          14       14              
  Lines        1805     1795      -10     
==========================================
+ Hits          941      944       +3     
+ Misses        864      851      -13     

Impacted Files	Coverage Δ
src/bin/main.rs	0.75% <0.00%> (-0.05%)	⬇️
src/config.rs	54.08% <0.00%> (-1.13%)	⬇️
src/db.rs	48.97% <72.72%> (-1.03%)	⬇️
src/dev.rs	100.00% <100.00%> (ø)
src/lib.rs	47.43% <0.00%> (+1.81%)	⬆️

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