revert Chunk structure to maintain consistent hashes

[koko1123]

No description provided.

[pattyshack]

something seems wrong here. forgot to rebase?

[github-actions]

FVM Benchstat comparison

This branch with compared with the base branch onflow:master commit cb14878

The command (for i in {1..7}; do go test ./fvm ./engine/execution/computation --bench . --tags relic -shuffle=on --benchmem --run ^$; done) was used.

Collapsed results for better readability

[codecov-commenter]

Codecov Report

Merging #4351 (98522a5) into master (0f41027) will decrease coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4351      +/-   ##
==========================================
- Coverage   53.84%   53.81%   -0.03%     
==========================================
  Files         870      870              
  Lines       80518    80518              
==========================================
- Hits        43355    43332      -23     
- Misses      33754    33778      +24     
+ Partials     3409     3408       -1     

Flag	Coverage Δ
unittests	53.81% <ø> (-0.03%)	⬇️

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

Impacted Files	Coverage Δ
model/flow/chunk.go	32.14% <ø> (ø)

... and 8 files with indirect coverage changes