Babe config repository

[xDimon]

Referenced issues

Resolves #1345

Description of the Change

Implemented using of babe config over babe config repository. As result babe config is obtaining on demand. Config from last finalized block (from genesis in some cases) is using. It helps to avoid crash if runtime inaccessible for target block.

Benefits

No crash in that exceptional cases.

Possible Drawbacks

Sometimes might be done one extra wasm compilation.

Usage Examples or Tests

Existing tests is adapted.

[codecov]

Codecov Report

Merging #1354 (6340a35) into master (610d964) will increase coverage by 0.01%.
The diff coverage is 28.00%.

@@            Coverage Diff             @@
##           master    #1354      +/-   ##
==========================================
+ Coverage   24.39%   24.40%   +0.01%     
==========================================
  Files         619      621       +2     
  Lines       23038    23062      +24     
  Branches    12021    12030       +9     
==========================================
+ Hits         5619     5629      +10     
+ Misses      12231    12226       -5     
- Partials     5188     5207      +19     

Impacted Files	Coverage Δ
core/blockchain/impl/block_storage_impl.cpp	22.80% <ø> (+0.58%)	⬆️
core/blockchain/impl/block_tree_impl.hpp	33.33% <ø> (ø)
core/consensus/babe/impl/babe_impl.hpp	100.00% <ø> (ø)
core/consensus/babe/impl/babe_lottery_impl.cpp	28.57% <0.00%> (ø)
core/consensus/validation/babe_block_validator.hpp	100.00% <ø> (ø)
core/consensus/babe/impl/babe_util_impl.cpp	13.72% <17.64%> (-0.57%)	⬇️
core/blockchain/impl/block_tree_impl.cpp	21.19% <18.75%> (-0.27%)	⬇️
core/consensus/babe/impl/block_appender_impl.cpp	7.19% <25.00%> (-0.06%)	⬇️
core/consensus/babe/impl/babe_impl.cpp	14.05% <26.66%> (+0.03%)	⬆️
core/consensus/validation/babe_block_validator.cpp	34.78% <28.57%> (-1.59%)	⬇️
... and 10 more

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