fix(list)!: change compound attribute names to kebab-case

BREAKING_CHANGE: Attributes `listtabindex`, `supportingtext`, `multilinesupportingtext`, `trailingsupportingtext`, and `itemtabindex` have been renamed to `list-tabindex`, `supporting-text`, `multi-line-supporting-text`, `trailing-supporting-text`, and `item-tabindex`.
PiperOrigin-RevId: 542629274

list/lib/list.ts

@@ -51,7 +51,7 @@ export class List extends LitElement {
  /**
  * The tabindex of the underlying list.
  */
- @property({type: Number}) listTabIndex = 0;
+ @property({type: Number, attribute: 'list-tabindex'}) listTabIndex = 0;
 
  @query('.md3-list') listRoot!: HTMLElement|null;
 

list/lib/listitem/list-item.ts

@@ -46,18 +46,20 @@ export class ListItemEl extends LitElement implements ListItem {
  * `multiLineSupportingText` to `true` to support multiple lines in the
  * supporting text.
  */
- @property() supportingText = '';
+ @property({attribute: 'supporting-text'}) supportingText = '';
 
  /**
  * Modifies `supportingText` to support multiple lines.
  */
- @property({type: Boolean}) multiLineSupportingText = false;
+ @property({type: Boolean, attribute: 'multi-line-supporting-text'})
+ multiLineSupportingText = false;
 
  /**
  * The supporting text placed at the end of the item. Overridden by elements
  * slotted into the `end` slot.
  */
- @property() trailingSupportingText = '';
+ @property({attribute: 'trailing-supporting-text'})
+ trailingSupportingText = '';
 
  /**
  * Disables the item and makes it non-selectable and non-interactive.
@@ -70,7 +72,7 @@ export class ListItemEl extends LitElement implements ListItem {
  * __NOTE:__ this is overridden by the keyboard behavior of `md-list` and by
  * setting `selected`.
  */
- @property({type: Number}) itemTabIndex = -1;
+ @property({type: Number, attribute: 'item-tabindex'}) itemTabIndex = -1;
 
  /**
  * Whether or not the element is actively being interacted with by md-list.