add(layout/tab): Tab layout implementation

build.zig

@@ -73,6 +73,14 @@ pub fn build(b: *std.Build) void {
     });
     tui_example.root_module.addImport("zterm", lib);
 
+    const tabs_example = b.addExecutable(.{
+        .name = "tabs",
+        .root_source_file = b.path("examples/tabs.zig"),
+        .target = target,
+        .optimize = optimize,
+    });
+    tabs_example.root_module.addImport("zterm", lib);
+
     // This declares intent for the executable to be installed into the
     // standard location when the user invokes the "install" step (the default
     // step when running `zig build`).
@@ -81,6 +89,7 @@ pub fn build(b: *std.Build) void {
     b.installArtifact(padding_example);
     b.installArtifact(exec_example);
     b.installArtifact(tui_example);
+    b.installArtifact(tabs_example);
 
     // Creates a step for unit testing. This only builds the test executable
     // but does not run it.