Add wasmi Wasm simd proposal support skeleton

[Robbepop]

This add foundations for Wasm simd proposal support in the wasmi crate.

[codecov]

Codecov Report

Attention: Patch coverage is 0.23923% with 417 lines in your changes missing coverage. Please review.

Project coverage is 67.46%. Comparing base (dcafe1c) to head (fb44251).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/wasmi/src/engine/translator/simd/visit.rs	0.00%	256 Missing ⚠️
crates/wasmi/src/engine/executor/instrs.rs	0.00%	157 Missing ⚠️
crates/wasmi/src/engine/config.rs	33.33%	2 Missing ⚠️
crates/wasmi/src/engine/translator/visit.rs	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1415      +/-   ##
==========================================
- Coverage   69.37%   67.46%   -1.92%     
==========================================
  Files         158      159       +1     
  Lines       14702    15120     +418     
==========================================
  Hits        10200    10200              
- Misses       4502     4920     +418     

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