[Soft] adding new experimental shader interpreter based on new IR

src/software/lib.zig

@@ -6,6 +6,7 @@ pub const c = @import("soft_c");
 pub const config = base.config;
 
 pub const Device = @import("device/Device.zig");
+pub const interpreter = @import("interpreter/root.zig");
 
 pub const SoftInstance = @import("SoftInstance.zig");
 pub const SoftDevice = @import("SoftDevice.zig");
@@ -84,6 +85,7 @@ comptime {
 
 test {
     std.testing.refAllDecls(Device);
+    std.testing.refAllDecls(interpreter);
     std.testing.refAllDecls(SoftBinarySemaphore);
     std.testing.refAllDecls(SoftBuffer);
     std.testing.refAllDecls(SoftBufferView);