refactor: make match-collector export its types, and consume them in frontend

frontend/pages/tierlist/[lane].vue

@@ -1,10 +1,14 @@
 <script setup lang="ts">
 import { LANE_IMAGES, lanePositionToIndex, POSITIONS_STR } from '~/utils/cdragon'
 
+import type { LaneData, ChampionData, Champion } from 'match_collector'
+
 const route = useRoute()
 const lane = route.params.lane as string
 
-const { data: championsData }: ChampionsResponse = await useFetch('/api/cdragon/champion-summary')
+const { data: championsData }: { data: Ref<Array<Champion>> } = await useFetch(
+  '/api/cdragon/champion-summary'
+)
 
 const { data: championsLanes }: { data: Ref<Array<ChampionData>> } =
   await useFetch('/api/champions')