Add Label Primitive

[ashwinvaidya17]

What does this PR do?

label1 = Label(label="Label 1")
label2 = Label(label="Label 2", bg_color="red")
label3 = Label(label="Label 3", bg_color="blue")

scene = MockScene(image, label=[label1, label2, label3], layout=Flatten(Label))
scene.save("scene_flatten.jpg")

scene = MockScene(image, label=[label1, label2, label3], layout=HStack(Label))
scene.save("scene_hstack.jpg")

Fixes # (issue)

Before submitting

• This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
• Did you make sure to update the documentation with your changes?
• Did you write any new necessary tests?