task(storage/child-trie): implement store/load of child trie from DB

[kishansagathiya]

Changes

• implement store/load of child trie from DB

Tests

Issues

• implement store/load of child trie from DB #1490

Primary Reviewer

• @qdm12

[codecov]

Codecov Report

Merging #2122 (06c7a3d) into development (cc3599a) will decrease coverage by 0.08%.
The diff coverage is 64.61%.

@@               Coverage Diff               @@
##           development    #2122      +/-   ##
===============================================
- Coverage        61.54%   61.46%   -0.09%     
===============================================
  Files              213      213              
  Lines            27469    27497      +28     
===============================================
- Hits             16906    16901       -5     
- Misses            8697     8721      +24     
- Partials          1866     1875       +9     

Flag	Coverage Δ
unit-tests	61.46% <64.61%> (-0.09%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
lib/trie/database.go	47.86% <0.00%> (-3.11%)	⬇️
lib/trie/child_storage.go	44.26% <25.00%> (ø)
internal/trie/node/branch_encode.go	87.28% <100.00%> (+2.43%)	⬆️
dot/network/inbound.go	82.14% <0.00%> (-7.15%)	⬇️
dot/network/test_helpers.go	79.02% <0.00%> (-3.50%)	⬇️
dot/network/message.go	66.52% <0.00%> (-2.61%)	⬇️
lib/grandpa/message.go	61.15% <0.00%> (-2.16%)	⬇️
dot/network/notifications.go	64.50% <0.00%> (-1.37%)	⬇️
lib/grandpa/vote_message.go	80.73% <0.00%> (-1.23%)	⬇️
... and 1 more

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[kishansagathiya]

I should have made this draft.
There was some code leftover, which I used to test things out, but forgot to remove while making the PR.

Some of the changes that I made earlier were not required after applying changes recommended by noot.

@qdm12 Made changes you asked for in last two commits.

[qdm12]

Nice 👍 Sorry I didn't know it was still a drafty PR 😉 Note you can convert it back to draft even if you open it as non-draft (although people will still be notified for reviews).

[noot]

looks good to me! awesome work :D

created a separate small task, so that I can merge this now #2171