refactor: expose an internal cloning to the callers

[akhi3030]

Helps address this issue: #13075 (comment).

[codecov]

Codecov Report

Attention: Patch coverage is 85.71429% with 2 lines in your changes missing coverage. Please review.

Project coverage is 70.00%. Comparing base (10ebcc4) to head (6a732c1).

Files with missing lines	Patch %	Lines
...chain/src/stateless_validation/chunk_validation.rs	85.71%	1 Missing ⚠️
...client/src/stateless_validation/shadow_validate.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #13112      +/-   ##
==========================================
+ Coverage   69.93%   70.00%   +0.06%     
==========================================
  Files         863      863              
  Lines      176727   176728       +1     
  Branches   176727   176728       +1     
==========================================
+ Hits       123593   123713     +120     
+ Misses      47965    47838     -127     
- Partials     5169     5177       +8     

Flag	Coverage Δ
backward-compatibility	0.36% <0.00%> (-0.01%)	⬇️
db-migration	0.36% <0.00%> (-0.01%)	⬇️
genesis-check	1.43% <0.00%> (?)
linux	69.83% <85.71%> (+0.07%)	⬆️
linux-nightly	69.54% <85.71%> (-0.03%)	⬇️
pytests	1.74% <0.00%> (+1.37%)	⬆️
sanity-checks	1.55% <0.00%> (?)
unittests	69.83% <85.71%> (+<0.01%)	⬆️
upgradability	0.36% <0.00%> (?)

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