Improve tweaking for high throughput (#610)

* Option "--disable-ext-msg-broadcast"

* "Get shard out queue size" query

* Move disabling ext msg broadcasts from command-line arguments to config

* Fix compilation error

* Asynchronous store_cell and gc in celldb

* Make GC in celldb work evenly over time

* Increase timeouts for downloading blocks

* Reuse blocks from previous rounds in validator session

* Use Rldp2 in FullNode for downloading persistent states and archives

* Improve logs in download-archive-slice and download-state

* Decrease delay between serializing shards

* Make CellDbIn::load_cell synchronous to avoid interfering with store_cell

---------

Co-authored-by: SpyCheese <mikle98@yandex.ru>

tl/generate/scheme/ton_api.tl

@@ -588,12 +588,14 @@ engine.gc ids:(vector int256) = engine.Gc;
 engine.dht.config dht:(vector engine.dht) gc:engine.gc = engine.dht.Config;
 engine.validator.fullNodeMaster port:int adnl:int256 = engine.validator.FullNodeMaster;
 engine.validator.fullNodeSlave ip:int port:int adnl:PublicKey = engine.validator.FullNodeSlave;
+engine.validator.fullNodeConfig ext_messages_broadcast_disabled:Bool = engine.validator.FullNodeConfig;
 engine.validator.config out_port:int addrs:(vector engine.Addr) adnl:(vector engine.adnl) 
         dht:(vector engine.dht)
         validators:(vector engine.validator) fullnode:int256 fullnodeslaves:(vector engine.validator.fullNodeSlave)
         fullnodemasters:(vector engine.validator.fullNodeMaster)
+        fullnodeconfig:engine.validator.fullNodeConfig
         liteservers:(vector engine.liteServer) control:(vector engine.controlInterface)
-        gc:engine.gc = engine.validator.Config; 
+        gc:engine.gc = engine.validator.Config;
 
 ---functions---
 ---types---
@@ -642,6 +644,8 @@ engine.validator.onePerfTimerStat time:int min:double avg:double max:double = en
 engine.validator.perfTimerStatsByName name:string stats:(vector engine.validator.OnePerfTimerStat) = engine.validator.PerfTimerStatsByName;
 engine.validator.perfTimerStats stats:(vector engine.validator.PerfTimerStatsByName) = engine.validator.PerfTimerStats;
 
+engine.validator.shardOutQueueSize size:int = engine.validator.ShardOutQueueSize;
+
 
 ---functions---
 
@@ -693,6 +697,8 @@ engine.validator.signShardOverlayCertificate workchain:int shard:long signed_key
 engine.validator.importShardOverlayCertificate workchain:int shard:long signed_key:engine.validator.KeyHash cert:overlay.Certificate = engine.validator.Success;
 
 engine.validator.getPerfTimerStats name:string = engine.validator.PerfTimerStats;
+engine.validator.getShardOutQueueSize flags:# block_id:tonNode.blockId dest_wc:flags.0?int dest_shard:flags.0?long = engine.validator.ShardOutQueueSize;
+engine.validator.setExtMessagesBroadcastDisabled disabled:Bool = engine.validator.Success;
 
 ---types---