gh-137: added CAMB nonlinear fix

[ivansladoljev]

📌 Related Issue

Closes #137

✨ What’s been added or changed?

cloelike calls NonLinPerturbations with the signature (background, linearperturbations, redshifts, log10TAGN) to support emulator-based classes that compute nonlinear boosts from pre-computed linear power spectra.
CAMBNonLinearPerturbations was missing the linearperturbations argument, making it incompatible with the inference pipeline. This PR adds linearperturbations as a mock parameter — CAMB computes nonlinear corrections internally and does not use it.

🧪 How was it tested?

from cloelib.cosmology.camb_cosmology import CAMBBackground, CAMBLinearPerturbations, CAMBNonLinearPerturbations
import numpy as np

bg = CAMBBackground(H0=67.0, Omega_b0=0.049, Omega_cdm0=0.270, Omega_k0=0.0,
                    As=2.1e-9, ns=0.96, mnu=0.06, w0=-1.0, wa=0.0,
                    gamma_MG=0.0, N_mnu=1)
zs = np.linspace(0.01, 2.0, 10)
lp = CAMBLinearPerturbations(bg, zs)
nlp = CAMBNonLinearPerturbations(bg, lp, zs)
print(nlp.sigma8_0())  # expected: ~0.816

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