Add log with best and finalized blocks on launch

[Harrm]

Referenced issues

None.

Description of the Change

Self-descriptive.

Benefits

For example, it's easy to know what block to run recovery on when node initialisation fails.

Possible Drawbacks

None expected.

[codecov]

Codecov Report

Merging #1414 (913159e) into master (2b6d360) will increase coverage by 0.01%.
The diff coverage is 0.00%.

❗ Current head 913159e differs from pull request most recent head c6edf22. Consider uploading reports for the commit c6edf22 to get more accurate results

@@            Coverage Diff             @@
##           master    #1414      +/-   ##
==========================================
+ Coverage   24.31%   24.33%   +0.01%     
==========================================
  Files         643      643              
  Lines       24260    24252       -8     
  Branches    12577    12574       -3     
==========================================
+ Hits         5899     5901       +2     
+ Misses      13096    13083      -13     
- Partials     5265     5268       +3     

Impacted Files	Coverage Δ
core/blockchain/impl/block_tree_impl.cpp	19.77% <0.00%> (-0.04%)	⬇️
core/subscription/subscriber.hpp	62.22% <0.00%> (-0.83%)	⬇️
node/main.cpp	0.00% <0.00%> (ø)
core/primitives/transcript.hpp	72.72% <0.00%> (ø)
core/utils/kagome_db_editor.cpp	0.00% <0.00%> (ø)
core/network/impl/peer_manager_impl.cpp	3.26% <0.00%> (+<0.01%)	⬆️
core/api/service/impl/api_service_impl.cpp	14.47% <0.00%> (+1.01%)	⬆️

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