ENH: update html parameter display to match scikit-learn style

[AnimeshPatra2005]

Reference Issues/PRs

Closes #503. Related to sktime/sktime#9497.

What does this implement/fix? Explain your changes.

scikit-learn has updated how they display parameters in the HTML representation of estimators. This PR updates scikit-base to match.

Previously, clicking an estimator box in a Jupyter notebook showed a raw <pre> string like MyEstimator(alpha=0.5).

This PR replaces that with a structured two-column parameter table built from get_params(deep=False), showing each parameter name and its current value in a cleaner, more readable format.

Changes:

• New _params_to_html_table() helper that generates the table HTML
• _write_label_html() gains an optional estimator parameter; when provided, renders the table instead of the pre block
• _write_base_object_html() passes the estimator through
• CSS styles for the table appended to _STYLE

Does your contribution introduce a new dependency? If yes, which one?

No.

What should a reviewer concentrate their feedback on?

• The CSS styling choices for the parameter table
• Whether the fallback to <pre> for non-estimator objects is correct

Any other comments?

Marked as Draft, happy to add unit tests once the approach is confirmed as the right direction.