parachain availability store

[turuslan]

Referenced issues

• Data availability #1311

Description of the Change

Add availability store interface.

Benefits

• Store chunks, pov and data.
• Interface will be used by multiple components (candidate backing, availability distribution, ...).

Possible Drawbacks

• Implement pruning later.

Usage Examples or Tests

Alternate Designs

• Will read/write database later.

[codecov]

Codecov Report

Merging #1333 (ee39702) into master (0c3398f) will decrease coverage by 0.06%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #1333      +/-   ##
==========================================
- Coverage   25.00%   24.93%   -0.07%     
==========================================
  Files         610      612       +2     
  Lines       22553    22588      +35     
  Branches    11779    11794      +15     
==========================================
- Hits         5640     5633       -7     
- Misses      11705    11753      +48     
+ Partials     5208     5202       -6     

Impacted Files	Coverage Δ
core/injector/application_injector.cpp	32.32% <ø> (ø)
core/parachain/availability/store/store_impl.cpp	0.00% <0.00%> (ø)
core/parachain/availability/store/store_impl.hpp	0.00% <0.00%> (ø)
core/metrics/impl/session_impl.cpp	37.50% <0.00%> (-8.34%)	⬇️
core/api/transport/impl/ws/ws_listener_impl.cpp	40.27% <0.00%> (-2.78%)	⬇️
core/metrics/impl/prometheus/handler_impl.cpp	26.53% <0.00%> (-2.05%)	⬇️

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