feat: Make ui.command to support path and download props #2224

[marek-mihok]

The PR fulfills these requirements: (check all the apply)

• It's submitted to the main branch.
• When resolving a specific issue, it's referenced in the PR's title (e.g. feat: Add a button #xxx, where "xxx" is the issue number).
• When resolving a specific issue, the PR description includes Closes #xxx, where "xxx" is the issue number.
• If changes were made to ui folder, unit tests (make test) still pass.
• New/updated tests are included

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Adds path and download attributes to ui.command to support the same behavior as ui.link():

export interface Command {
  /** An identifying name for this component. If the name is prefixed with a '#', the command sets the location hash to the name when executed. */
  name: Id
  /** The text displayed for this command. */
  label?: S
  /** The caption for this command (typically a tooltip). */
  caption?: S
  /** The icon to be displayed for this command. */
  icon?: S
  /** Sub-commands, if any */
  items?: Command[]
  /** Data associated with this command, if any. */
  value?: S
  /** The path or URL to link to. The 'items' and 'value' props are ignored when specified. */
  path?: S
  /** True if the link should prompt the user to save the linked URL instead of navigating to it. */
  download?: B
}

Closes #2224

[mturoci]

LGTM. Just one question.