cmd/geth, consensus/ethash: add support for --miner.notify.full flag (#22558)

The PR implements the --miner.notify.full flag that enables full pending block
notifications. When this flag is used, the block notifications sent to mining
endpoints contain the complete block header JSON instead of a work package
array.

Co-authored-by: AlexSSD7 <alexandersadovskyi7@protonmail.com>
Co-authored-by: Martin Holst Swende <martin@swende.se>

consensus/ethash/algorithm_test.go

@@ -726,10 +726,14 @@ func TestConcurrentDiskCacheGeneration(t *testing.T) {
 
 	for i := 0; i < 3; i++ {
 		pend.Add(1)
-
 		go func(idx int) {
 			defer pend.Done()
-			ethash := New(Config{cachedir, 0, 1, false, "", 0, 0, false, ModeNormal, nil}, nil, false)
+
+			config := Config{
+				CacheDir:     cachedir,
+				CachesOnDisk: 1,
+			}
+			ethash := New(config, nil, false)
 			defer ethash.Close()
 			if err := ethash.verifySeal(nil, block.Header(), false); err != nil {
 				t.Errorf("proc %d: block verification failed: %v", idx, err)