FEAT(web): add showItemCount and renderTitle props to MultiList and SingleList (#1603)

[Talha12Shiekh]

Proposed Changes

Resolves issue #1603 by adding showItemCount and renderTitle props to MultiList and SingleList components:

1. showItemCount (Boolean prop, default: false): When enabled, renders the count of active/filtered list items next to the title header in MultiList and SingleList.
2. renderTitle (Function / Node prop): Provides a custom renderer function renderTitle(itemsCount, listItems) allowing developers to fully customize title rendering and display item counts.
3. TypeScript & PropType Definitions: Updated MultiList.d.ts, SingleList.d.ts, propTypes, and defaultProps.

Linked Issues

• Fixes Items Count next to MutliList Title #1603 ([Feature Request] item count next to Title in MultiList)

Usage Example:

// Display item count next to title
<MultiList
  componentId="BookSensor"
  dataField="books.keyword"
  title="Books Filter"
  showItemCount={true}
/>

// Custom title renderer with item count
<MultiList
  componentId="BookSensor"
  dataField="books.keyword"
  renderTitle={(count) => <h3>Books Filter ({count})</h3>}
/>

Checklist

• Describe the proposed changes and how it'll improve the library experience.
• Please make sure that there are no linting errors in the code.
• Add a demo video/gif/screenshot to explain how did you test the fix.
• If it is a global change, try to add any side effects that it could have.
• Create a PR to add/update the docs (if needed) at here.
• Create a PR to add/update the storybook (if needed) at here.

Improvements to the Library Experience

• Developer Experience & Feature Parity: Fulfills feature request Items Count next to MutliList Title #1603, allowing developers to display item counts next to component title headers or customize title rendering.

Side Effects

• None. Default behavior remains unchanged (showItemCount defaults to false).

Testing

• Verified Babel CommonJS and ES module compilation across MultiList.js, SingleList.js, MultiList.d.ts, and SingleList.d.ts.