cannon: Fix unaligned pre-image key writes in Go VM

[Inphi]

Fixes a mips.go bug where pre-image key writes from unaligned memory would always start at the aligned offset.

For example, given a buffer containing 0xdeADbeEF (big-endian) located at 0x32000001, writing 1 byte to the pre-image request stream should only write a 0xAD value.

[changeset-bot]

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Latest commit: d36bdd3

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[codecov]

Codecov Report

Merging #6191 (9663adb) into develop (add32f6) will increase coverage by 0.01%.
The diff coverage is 100.00%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #6191      +/-   ##
===========================================
+ Coverage    44.68%   44.69%   +0.01%     
===========================================
  Files          448      448              
  Lines        29383    29383              
  Branches       691      691              
===========================================
+ Hits         13129    13133       +4     
+ Misses       15184    15182       -2     
+ Partials      1070     1068       -2     

Flag	Coverage Δ
bedrock-go-tests	43.59% <ø> (+0.01%)	⬆️
cannon-go-tests	61.78% <100.00%> (+0.07%)	⬆️
common-ts-tests	26.82% <ø> (ø)
contracts-bedrock-tests	58.75% <ø> (ø)
core-utils-tests	49.06% <ø> (ø)
fault-detector-tests	26.95% <ø> (ø)
sdk-tests	42.43% <ø> (ø)

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

Impacted Files	Coverage Δ
cannon/mipsevm/mips.go	92.25% <100.00%> (+0.22%)	⬆️

... and 2 files with indirect coverage changes

[protolambda]

nice find!

[mergify]

This PR has been added to the merge queue, and will be merged soon.

[mergify]

This PR is next in line to be merged, and will be merged as soon as checks pass.