Fast pruner start

[Harrm]

Referenced issues

Description of the Change

Pruner starts immediately at a cost of no longer pruning the nodes already in storage at the time of the node startup (because without the long full state ref counting the pruner has no idea whether it can prune them or they are a part of the current state). CLI option --enable-thorough-pruning turns the old behaviour on (long startup, slightly better pruning).

Benefits

The node starts immediately.

Possible Drawbacks

Less effective pruning.

Alternate Designs

Asynchronous reference counting (and pruning overall) -- can be implemented in the future, but it's more complicated and with the reference counting taking half an hour on HDDs doesn't seem like a complete fix.

Persistent pruner state -- can be implemented in future, but it's more complicated and currently there's no clear vision how to do it.

[codecov]

Codecov Report

Merging #1756 (a5d00b6) into master (604aef1) will decrease coverage by 0.02%.
The diff coverage is 4.00%.

❗ Current head a5d00b6 differs from pull request most recent head 30dd5df. Consider uploading reports for the commit 30dd5df to get more accurate results

@@            Coverage Diff             @@
##           master    #1756      +/-   ##
==========================================
- Coverage   21.71%   21.69%   -0.02%     
==========================================
  Files         746      746              
  Lines       32085    32100      +15     
  Branches    16661    16672      +11     
==========================================
- Hits         6966     6964       -2     
- Misses      19306    19318      +12     
- Partials     5813     5818       +5     

Files Changed	Coverage Δ
core/application/app_configuration.hpp	100.00% <ø> (ø)
core/application/impl/app_configuration_impl.cpp	20.37% <0.00%> (-0.11%)	⬇️
core/application/impl/app_configuration_impl.hpp	22.82% <0.00%> (-0.51%)	⬇️
core/runtime/common/memory_allocator.cpp	53.52% <0.00%> (-0.65%)	⬇️
...e/storage/trie/impl/persistent_trie_batch_impl.cpp	26.66% <0.00%> (ø)
core/storage/trie_pruner/impl/trie_pruner_impl.hpp	66.66% <ø> (ø)
core/storage/trie_pruner/impl/trie_pruner_impl.cpp	29.54% <6.25%> (-1.56%)	⬇️

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