Downloader sync-loop integration

[mriccobene]

Move downloader to sync-loop

[codecov]

Codecov Report

Merging #770 (122174a) into master (2465bba) will decrease coverage by 0.10%.
The diff coverage is 29.41%.

@@            Coverage Diff             @@
##           master     #770      +/-   ##
==========================================
- Coverage   75.05%   74.94%   -0.11%     
==========================================
  Files         196      196              
  Lines       14092    14106      +14     
  Branches     2204     2208       +4     
==========================================
- Hits        10577    10572       -5     
- Misses       2593     2600       +7     
- Partials      922      934      +12     

Impacted Files	Coverage Δ
node/silkworm/db/mdbx.hpp	75.00% <0.00%> (ø)
...de/silkworm/downloader/internals/body_sequence.cpp	78.76% <ø> (ø)
...silkworm/downloader/internals/grpc_sync_client.hpp	0.00% <ø> (ø)
node/silkworm/downloader/sentry_client.hpp	0.00% <ø> (ø)
...ode/silkworm/downloader/internals/header_chain.cpp	58.72% <31.25%> (-0.50%)	⬇️
core/silkworm/consensus/pos/engine.cpp	83.33% <0.00%> (-16.67%)	⬇️
node/silkworm/rpc/server/call.hpp	69.71% <0.00%> (-1.43%)	⬇️
node/silkworm/rpc/server/server_context_pool.cpp	60.97% <0.00%> (-0.82%)	⬇️
core/silkworm/state/in_memory_state.cpp	92.18% <0.00%> (-0.53%)	⬇️
core/silkworm/types/block.cpp	87.00% <0.00%> (-0.50%)	⬇️
... and 1 more

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