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                                            Martin Klemsa

MDCList performance patch for listElements()

* Added element cache to MDCList listElements getter This fixes performance of complexity O(n^2) operations which call listElements() within a loop. See [MDCListFoundation.getSelectedIndexFromDOM](https://github.com/material-components/material-components-web/blob/9290bd3b0b919a022d6ff0cfd1c27bb66f7fd44b/packages/mdc-list/foundation.ts#L199) which becomes noticeably slow once a list...