Added db.BlocksBySlot and db.BlockRootsBySlot (#8184)

* Added blockBySlot and blockRootBySlot

* Changed to BlocksBySlot and BlockRootsBySlot

* Updated to use BlocksBySlot and BlockRootsBySlot

* Added missing passthrough to karfa exporter

* Return hasBlocks/hasBlockRoots in the new getters

* Fixed CI lint

* Replace call to bytes.Compare with bytes.Equal

* Reordered the returns of the new getters

Co-authored-by: Nishant Das <nishdas93@gmail.com>
Co-authored-by: Raul Jordan <raul@prysmaticlabs.com>

tools/blocktree/main.go

@@ -69,8 +69,7 @@ func main() {
 		// If the state is not available, roll back
 		for state == nil {
 			slot--
-			filter := filters.NewFilter().SetStartSlot(slot).SetEndSlot(slot)
-			rts, err := db.BlockRoots(context.Background(), filter)
+			_, rts, err := db.BlockRootsBySlot(context.Background(), slot)
 			if err != nil {
 				panic(err)
 			}