Use Pebble Database for storing protocol data (Proof of concept)

[zhangchiqing]

Close #6137

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 43.75%. Comparing base (e31cf85) to head (c0847e3).
Report is 106 commits behind head on v0.33.

❗ There is a different number of reports uploaded between BASE (e31cf85) and HEAD (c0847e3). Click for more details.

HEAD has 7 uploads less than BASE

| Flag | BASE (e31cf85) | HEAD (c0847e3) | |------|------|------| |unittests|8|1|

Additional details and impacted files

@@            Coverage Diff             @@
##            v0.33    #6161      +/-   ##
==========================================
- Coverage   50.97%   43.75%   -7.23%     
==========================================
  Files         281        8     -273     
  Lines       23932      432   -23500     
==========================================
- Hits        12199      189   -12010     
+ Misses      10981      238   -10743     
+ Partials      752        5     -747     

Flag	Coverage Δ
unittests	43.75% <ø> (-7.23%)	⬇️

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[zhangchiqing]

Close in favor of #6197