Implement ImportMeta callback

The first time `import.meta` is called within a module, this callback is called
and we can populate it with whatever fields we want. For WebAPI, the important
field is `url`:
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/import.meta

Depends on: https://github.com/lightpanda-io/zig-v8-fork/pull/80

src/main.zig

@@ -580,7 +580,7 @@ fn parseCommonArg(
         var it = std.mem.splitScalar(u8, str, ',');
         while (it.next()) |part| {
             try arr.append(allocator, std.meta.stringToEnum(log.Scope, part) orelse {
-                log.fatal(.app, "invalid option choice", .{ .arg = "--log_scope_filter", .value = part });
+                log.fatal(.app, "invalid option choice", .{ .arg = "--log_filter_scopes", .value = part });
                 return false;
             });
         }