Update MPS Chebyshev approximation

[jjrodriguezaldavero]

• Adds Chebyshev extrema nodes (for functions defined on closed domains).
• Adds projection nodes (useful for computing the accuracy of the approximation beforehand).
• Adds both the Clenshaw summation and standard polynomial evaluation to the functions using the clenshaw flag.
• Adds cheb2mpo to apply functions on MPOs.

@juanjosegarciaripoll

[juanjosegarciaripoll]

Can you fix the typing error? Otherwise the github will fail in any further changes we make. Please look at .github/workflows/jobs.yml to see how to run mypy and flake / ruff to check for errors.

[jjrodriguezaldavero]

Fixed @juanjosegarciaripoll