Lower load and store instructions by pruning types where possible

[Robbepop]

Closes #1302.

[codecov]

Codecov Report

Attention: Patch coverage is 80.00000% with 26 lines in your changes missing coverage. Please review.

Project coverage is 81.58%. Comparing base (7a302a9) to head (85dac8e).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/wasmi/src/engine/translator/visit.rs	0.00%	24 Missing ⚠️
crates/wasmi/src/engine/executor/instrs.rs	91.66%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1303      +/-   ##
==========================================
- Coverage   81.59%   81.58%   -0.01%     
==========================================
  Files         306      306              
  Lines       25308    25270      -38     
==========================================
- Hits        20649    20616      -33     
+ Misses       4659     4654       -5     

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