[spv-out] Add access and access index support

[Timo-DK]

Description

Add support for Expression::Access and Expression::AccessIndex.

Expression::Access:

• Vector
• Matrix - Will be done at a later moment.
• Array - Will be done at a later moment.

Expression::AccessIndex:

• Vector
• Matrix - Will be done at a later moment.
• Array - Will be done at a later moment.
• Struct

WGSL test file

type Data = struct{
    [[offset(0)]] e: f32;
};

[[group(0), binding(0)]] var<uniform> u_data: Data;

[[stage(vertex)]]
fn main() -> void {
  var a: vec2<f32> = vec2<f32>(1.0, 1.0);
  
  # Expression::Access - Vector
  var b: f32 = a[0];
  
  # Expression::AccessIndex - Vector
  var c: f32 = a.x;
  
  # Expression::AccessIndex - Struct
  #var d: f32 = u_data.k;
  
  return;
}

[monocodus]

This is an autogenerated code review.New suggestions: 1

[monocodus]

This is an autogenerated code review.New suggestions: 1

[kvark]

Thank you!