Add Wasm simd proposal's official Wasm spec testsuite tests

[Robbepop]

For now the new simd specific tests are all ignored since Wasmi would not pass them.
This also enables Wasmi's simd crate feature by default for the wasmi_wast crate.

While implementing translation and execution of Wasm simd proposal instructions in Wasmi this PR allows to un-ignore each test case as it passes incrementally.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.37%. Comparing base (08bcf12) to head (b7d24e2).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1413   +/-   ##
=======================================
  Coverage   69.37%   69.37%           
=======================================
  Files         158      158           
  Lines       14702    14702           
=======================================
  Hits        10200    10200           
  Misses       4502     4502           

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