Implement translation and execution of some SIMD load instructions

[Robbepop]

➡️: Means that this instruction will be implemented in a follow-up PR.

	Instruction
✅	v128.load32_zero(m: memarg) -> v128
✅	v128.load64_zero(m: memarg) -> v128
✅	v128.load8_splat(m: memarg) -> v128
✅	v128.load16_splat(m: memarg) -> v128
✅	v128.load32_splat(m: memarg) -> v128
✅	v128.load64_splat(m: memarg) -> v128
➡️	v128.load8_lane(m: memarg, x: v128, imm: ImmLaneIdx16) -> v128
➡️	v128.load16_lane(m: memarg, x: v128, imm: ImmLaneIdx8) -> v128
➡️	v128.load32_lane(m: memarg, x: v128, imm: ImmLaneIdx4) -> v128
➡️	v128.load64_lane(m: memarg, x: v128, imm: ImmLaneIdx2) -> v128
✅	v128.load8x8_s(m: memarg)
✅	v128.load8x8_u(m: memarg)
✅	v128.load16x4_s(m: memarg)
✅	v128.load16x4_u(m: memarg)
✅	v128.load32x2_s(m: memarg)
✅	v128.load32x2_u(m: memarg)

[codecov]

Codecov Report

Attention: Patch coverage is 60.00000% with 34 lines in your changes missing coverage. Please review.

Project coverage is 71.09%. Comparing base (0f83a12) to head (808f3ba).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/wasmi/src/engine/executor/instrs.rs	43.33%	34 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1426      +/-   ##
==========================================
+ Coverage   70.86%   71.09%   +0.23%     
==========================================
  Files         161      161              
  Lines       16095    16167      +72     
==========================================
+ Hits        11405    11494      +89     
+ Misses       4690     4673      -17     

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