Limit number of open files by database

[GaroRobe]

Fixes #1314

Referenced issues

Limit number of open files by database #1314

Description of the Change

We set rocksdb setting for maximum opened files to half of system's soft-limit for file descriptors.

Benefits

We should stop running out of file descriptors.

Possible Drawbacks

Usage Examples or Tests

Alternate Designs

[codecov]

Codecov Report

Merging #1319 (9439c08) into master (04cc63f) will increase coverage by 0.01%.
The diff coverage is 22.22%.

@@            Coverage Diff             @@
##           master    #1319      +/-   ##
==========================================
+ Coverage   25.66%   25.67%   +0.01%     
==========================================
  Files         598      598              
  Lines       21566    21575       +9     
  Branches    11200    11205       +5     
==========================================
+ Hits         5534     5540       +6     
+ Misses      10919    10915       -4     
- Partials     5113     5120       +7     

Impacted Files	Coverage Δ
core/injector/application_injector.cpp	34.44% <0.00%> (-0.24%)	⬇️
core/common/fd_limit.cpp	10.25% <40.00%> (+10.25%)	⬆️
core/api/transport/impl/ws/ws_listener_impl.cpp	43.05% <0.00%> (+2.77%)	⬆️

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