common/prque: generic priority queue (#26290)

* common, core, eth, les, trie: make prque generic

* les/vflux/server: fixed issues in priorityPool

* common, core, eth, les, trie: make priority also generic in prque

* les/flowcontrol: add test case for priority accumulator overflow

* les/flowcontrol: avoid priority value overflow

* common/prque: use int priority in some tests

No need to convert to int64 when we can just change the type used by the
queue.

* common/prque: remove comment about int64 range

---------

Co-authored-by: Zsolt Felfoldi <zsfelfoldi@gmail.com>
Co-authored-by: Felix Lange <fjl@twurst.com>

core/rawdb/chain_iterator.go

@@ -191,7 +191,7 @@ func indexTransactions(db ethdb.Database, from uint64, to uint64, interrupt chan
 		// in to be [to-1]. Therefore, setting lastNum to means that the
 		// prqueue gap-evaluation will work correctly
 		lastNum = to
-		queue   = prque.New(nil)
+		queue   = prque.New[int64, *blockTxHashes](nil)
 		// for stats reporting
 		blocks, txs = 0, 0
 	)
@@ -210,7 +210,7 @@ func indexTransactions(db ethdb.Database, from uint64, to uint64, interrupt chan
 				break
 			}
 			// Next block available, pop it off and index it
-			delivery := queue.PopItem().(*blockTxHashes)
+			delivery := queue.PopItem()
 			lastNum = delivery.number
 			WriteTxLookupEntries(batch, delivery.number, delivery.hashes)
 			blocks++
@@ -282,7 +282,7 @@ func unindexTransactions(db ethdb.Database, from uint64, to uint64, interrupt ch
 		// we expect the first number to come in to be [from]. Therefore, setting
 		// nextNum to from means that the prqueue gap-evaluation will work correctly
 		nextNum = from
-		queue   = prque.New(nil)
+		queue   = prque.New[int64, *blockTxHashes](nil)
 		// for stats reporting
 		blocks, txs = 0, 0
 	)
@@ -299,7 +299,7 @@ func unindexTransactions(db ethdb.Database, from uint64, to uint64, interrupt ch
 			if hook != nil && !hook(nextNum) {
 				break
 			}
-			delivery := queue.PopItem().(*blockTxHashes)
+			delivery := queue.PopItem()
 			nextNum = delivery.number + 1
 			DeleteTxLookupEntries(batch, delivery.hashes)
 			txs += len(delivery.hashes)