chore!: reinstate 2 min blocks for dibbler (#3720)

Description
---

- Updates dibble consensus to 2-minute blocks
- Updates dibbler genesis timestamp

Motivation and Context
---
Dibbler block times are too fast

How Has This Been Tested?
---

base_layer/core/src/blocks/genesis_block.rs

@@ -245,7 +245,7 @@ fn get_dibbler_genesis_block_raw() -> Block {
     );
     body.sort();
     // set genesis timestamp
-    let genesis = DateTime::parse_from_rfc2822("07 Jan 2022 00:00:00 +0200").unwrap();
+    let genesis = DateTime::parse_from_rfc2822("20 Jan 2022 00:00:00 +0200").unwrap();
     let timestamp = genesis.timestamp() as u64;
     Block {
         header: BlockHeader {

base_layer/core/src/consensus/consensus_constants.rs

@@ -248,10 +248,10 @@ impl ConsensusConstants {
         let mut algos = HashMap::new();
         // setting sha3/monero to 40/60 split
         algos.insert(PowAlgorithm::Sha3, PowAlgorithmConstants {
-            max_target_time: 180,
-            min_difficulty: 60_00.into(),
+            max_target_time: 1800,
+            min_difficulty: 60_000_000.into(),
             max_difficulty: u64::MAX.into(),
-            target_time: 30,
+            target_time: 300,
         });
         algos.insert(PowAlgorithm::Monero, PowAlgorithmConstants {
             max_target_time: 1200,
@@ -320,15 +320,15 @@ impl ConsensusConstants {
         // sha3/monero to 40/60 split
         algos.insert(PowAlgorithm::Sha3, PowAlgorithmConstants {
             max_target_time: 1800,
-            min_difficulty: 60_000.into(),
+            min_difficulty: 60_000_000.into(),
             max_difficulty: u64::MAX.into(),
-            target_time: 30,
+            target_time: 300,
         });
         algos.insert(PowAlgorithm::Monero, PowAlgorithmConstants {
             max_target_time: 1200,
-            min_difficulty: 60.into(),
+            min_difficulty: 60_000.into(),
             max_difficulty: u64::MAX.into(),
-            target_time: 20,
+            target_time: 200,
         });
         vec![ConsensusConstants {
             effective_from_height: 0,