refactor(connector-besu): tx poll per second not at full CPU speed

1. Prior to this change the polling function that waits for transactions
to be confirmed was running in  while loop without any delay, meaning that
the code that fetches the latest block is executing thousands of times
each second (or however fast the CPU in the machine/network connection are).
2. Now there is a second delay between each execution of the loop so that
we are not hammering the node of the ledger we are connected to.
3. This also has the added benefit of the test cases using this method
using much less CPU power.

Signed-off-by: Peter Somogyvari <[email protected]>

packages/cactus-plugin-ledger-connector-besu/src/main/typescript/plugin-ledger-connector-besu.ts

@@ -1,5 +1,6 @@
 import { Server } from "http";
 import { Server as SecureServer } from "https";
+import { setTimeout } from "timers/promises";
 
 import type { Server as SocketIoServer } from "socket.io";
 import type { Socket as SocketIoSocket } from "socket.io";
@@ -788,8 +789,14 @@ export class PluginLedgerConnectorBesu
     const startedAt = new Date();
 
     do {
+      const now = Date.now();
+      const elapsedTime = now - startedAt.getTime();
+      timedOut = now >= startedAt.getTime() + timeoutMs;
+      this.log.debug("%s tries=%n elapsedMs=%n", fnTag, tries, elapsedTime);
+      if (tries > 0) {
+        await setTimeout(1000);
+      }
       tries++;
-      timedOut = Date.now() >= startedAt.getTime() + timeoutMs;
       if (timedOut) {
         break;
       }