Makie bloch sphere extension

This PR introduces a new Makie-based Bloch sphere visualization extension for QuantumOpticsBase. Features: - `blochsphere(state::Ket)` renders the Bloch sphere for any spin-1/2 quantum state. - The Bloch vector is calculated directly from the `Ket` input. - Supports CairoMakie and GLMakie backends. - Sphere and arrows fully represent the quantum state. - Project.toml updated to include Makie as a weak dependency and an extension. Testing: - Example: ( in julia ) using QuantumOpticsBase using CairoMakie include("ext/QuantumOpticsBaseMakieExt.jl") using .QuantumOpticsBaseMakieExt b = SpinBasis(1//2) state = spinup(b) f = blochsphere(state)