[MaximeBICMTL]

Description

The electrophysiology browser, largely refactored in #11003, currently has its own Panel component. This component is very similar to the main Panel LORIS component but seems to contain a few bug fixes that were never upstreamed to the main component. This PR refactors the main LORIS component so that the electrophysiology browser can reuse it instead of having its own implementation.

List of changes

• Convert the Panel component from vanilla Javascript to Typescript.
• Remove prop-types from the component, which also were not in sync with the declared component types (string vs ReactNode).
• Rename the collapsing, initCollapsed, and class props to the more conventional collapsible, defaultCollapsed, and className props respectively.
• Fix the currently non-working defaultCollapsed prop.
• Change the default collapsible prop from true to false.
• Extract the views feature of the panel component, currently only used in the statistics dashboard (and arguably ugly IMO), into its own component. The architecture used here is the same as in the Modal refactor ([javascript] Split form and non-form modals and support custom modal footers #10695): a base highly-customisble PanelFrame component, a main Panel component easier to use with reasonable defaults, and a specialized PanelViews component that implements the desired feature.