Save lp2p key

[turuslan]

Referenced issues

#1072

Description of the Change

Try to save generated lp2p key if --save-node-key.

Benefits

Peer id preserved across restarts.

Possible Drawbacks

Usage Examples or Tests

Alternate Designs

[codecov]

Codecov Report

Merging #1301 (0f45076) into master (8d57222) will decrease coverage by 0.01%.
The diff coverage is 9.61%.

@@            Coverage Diff             @@
##           master    #1301      +/-   ##
==========================================
- Coverage   25.29%   25.27%   -0.02%     
==========================================
  Files         605      606       +1     
  Lines       21902    21910       +8     
  Branches    11359    11368       +9     
==========================================
- Hits         5540     5538       -2     
- Misses      11242    11251       +9     
- Partials     5120     5121       +1     

Impacted Files	Coverage Δ
core/application/app_configuration.hpp	100.00% <ø> (ø)
core/application/impl/app_configuration_impl.cpp	23.93% <0.00%> (-0.08%)	⬇️
core/application/impl/app_configuration_impl.hpp	30.00% <0.00%> (-0.89%)	⬇️
core/crypto/crypto_store/crypto_store_impl.hpp	37.77% <ø> (ø)
core/injector/get_peer_keypair.hpp	6.97% <6.97%> (ø)
core/injector/application_injector.cpp	34.58% <25.00%> (+1.36%)	⬆️
core/crypto/crypto_store/crypto_store_impl.cpp	24.82% <100.00%> (ø)

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