Add Args type

src/builtin/types.zig

@@ -1,5 +1,7 @@
 const std = @import("std");
 
+pub const Args = []const []const u8;
+
 pub const Shell = struct {
     running: bool = true,
     interrupted: bool = false,
@@ -10,7 +12,7 @@ pub const CommandContext = struct {
     io: std.Io,
     allocator: std.mem.Allocator,
     shell: *Shell,
-    argv: []const []const u8,
+    argv: Args,
 
     stdin: std.Io.File,
     stdout: std.Io.File,
@@ -24,7 +26,7 @@ pub const ResolvedCommand = union(enum) {
 };
 
 pub const Command = struct {
-    argv: []const []const u8,
+    argv: Args,
 };
 
 pub const Pipeline = struct {