Add quiet option to suppress output during fitting and portfolio building

[TheephopWS]

Summary

Add a quiet option to the fitting workflow (in _build_portfolio method) so users can suppress console output during model estimation.

Fix issues #28

What changed

• Added a new quiet argument to fit(...) (default: False).
• Passed quiet through the internal fit path into the ALS routine.
• Updated portfolio-building internals to accept quiet and use it to suppress informational panel-dimension printing.
• Updated docstrings to document the new parameter and behavior.

Example usage

model = InstrumentedPCA(n_factors=3)
model.fit(X, y, indices=indices, quiet=True)