Add cmp+select instruction fusion

[Robbepop]

Implements #1491.

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 184 lines in your changes missing coverage. Please review.

Project coverage is 70.81%. Comparing base (7b994f1) to head (d96e502).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/wasmi/src/engine/executor/instrs.rs	7.35%	126 Missing ⚠️
crates/wasmi/src/engine/translator/comparator.rs	47.61%	44 Missing ⚠️
crates/wasmi/src/engine/executor/instrs/select.rs	53.57%	13 Missing ⚠️
crates/wasmi/src/engine/translator/mod.rs	93.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1497      +/-   ##
==========================================
- Coverage   71.45%   70.81%   -0.64%     
==========================================
  Files         175      175              
  Lines       16341    16422      +81     
==========================================
- Hits        11676    11629      -47     
- Misses       4665     4793     +128     

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