Add Ropsten configuration (#3184)

## Issue Addressed

NA

## Proposed Changes

Adds the configuration for the upcoming merge of the Ropsten network, as per:

https://github.com/eth-clients/merge-testnets/pull/9

Use the Ropsten network with: `lighthouse --network ropsten`

## Additional Info

This is still a work-in-progress. We should wait for the eth-clients/merge-testnets PR to be approved before merging this into our `unstable`.

common/eth2_config/src/lib.rs

@@ -237,5 +237,6 @@ define_hardcoded_nets!(
     (mainnet, "mainnet", GENESIS_STATE_IS_KNOWN),
     (prater, "prater", GENESIS_STATE_IS_KNOWN),
     (gnosis, "gnosis", GENESIS_STATE_IS_KNOWN),
-    (kiln, "kiln", GENESIS_STATE_IS_KNOWN)
+    (kiln, "kiln", GENESIS_STATE_IS_KNOWN),
+    (ropsten, "ropsten", GENESIS_STATE_IS_KNOWN)
 );

common/eth2_network_config/built_in_network_configs/ropsten/boot_enr.yaml

@@ -0,0 +1,4 @@
+# Pari
+- enr:-Iq4QMCTfIMXnow27baRUb35Q8iiFHSIDBJh6hQM5Axohhf4b6Kr_cOCu0htQ5WvVqKvFgY28893DHAg8gnBAXsAVqmGAX53x8JggmlkgnY0gmlwhLKAlv6Jc2VjcDI1NmsxoQK6S-Cii_KmfFdUJL2TANL3ksaKUnNXvTCv1tLwXs0QgIN1ZHCCIyk
+# Teku
+- enr:-KG4QMJSJ7DHk6v2p-W8zQ3Xv7FfssZ_1E3p2eY6kN13staMObUonAurqyWhODoeY6edXtV8e9eL9RnhgZ9va2SMDRQMhGV0aDKQS-iVMYAAAHD0AQAAAAAAAIJpZIJ2NIJpcIQDhAAhiXNlY3AyNTZrMaEDXBVUZhhmdy1MYor1eGdRJ4vHYghFKDgjyHgt6sJ-IlCDdGNwgiMog3VkcIIjKA

common/eth2_network_config/built_in_network_configs/ropsten/config.yaml

@@ -0,0 +1,66 @@
+# Extends the mainnet preset
+PRESET_BASE: 'mainnet'
+CONFIG_NAME: 'ropsten'
+
+# Genesis
+# ---------------------------------------------------------------
+MIN_GENESIS_ACTIVE_VALIDATOR_COUNT: 100000
+# Monday, May 30th, 2022 3:00:00 PM +UTC
+MIN_GENESIS_TIME: 1653318000
+GENESIS_FORK_VERSION: 0x80000069
+GENESIS_DELAY: 604800
+
+
+# Forking
+# ---------------------------------------------------------------
+# Some forks are disabled for now:
+#  - These may be re-assigned to another fork-version later
+#  - Temporarily set to max uint64 value: 2**64 - 1
+
+# Altair
+ALTAIR_FORK_VERSION: 0x80000070
+ALTAIR_FORK_EPOCH: 500
+# Merge
+BELLATRIX_FORK_VERSION: 0x80000071
+BELLATRIX_FORK_EPOCH: 750
+TERMINAL_TOTAL_DIFFICULTY: 43531756765713534
+TERMINAL_BLOCK_HASH: 0x0000000000000000000000000000000000000000000000000000000000000000
+TERMINAL_BLOCK_HASH_ACTIVATION_EPOCH: 18446744073709551615
+
+# Sharding
+SHARDING_FORK_VERSION: 0x03001020
+SHARDING_FORK_EPOCH: 18446744073709551615
+
+# Time parameters
+# ---------------------------------------------------------------
+# 12 seconds
+SECONDS_PER_SLOT: 12
+# 14 (estimate from Eth1 mainnet)
+SECONDS_PER_ETH1_BLOCK: 14
+# 2**8 (= 256) epochs ~27 hours
+MIN_VALIDATOR_WITHDRAWABILITY_DELAY: 256
+# 2**8 (= 256) epochs ~27 hours
+SHARD_COMMITTEE_PERIOD: 256
+# 2**11 (= 2,048) Eth1 blocks ~8 hours
+ETH1_FOLLOW_DISTANCE: 2048
+
+
+# Validator cycle
+# ---------------------------------------------------------------
+# 2**2 (= 4)
+INACTIVITY_SCORE_BIAS: 4
+# 2**4 (= 16)
+INACTIVITY_SCORE_RECOVERY_RATE: 16
+# 2**4 * 10**9 (= 16,000,000,000) Gwei
+EJECTION_BALANCE: 16000000000
+# 2**2 (= 4)
+MIN_PER_EPOCH_CHURN_LIMIT: 4
+# 2**16 (= 65,536)
+CHURN_LIMIT_QUOTIENT: 65536
+
+
+# Deposit contract
+# ---------------------------------------------------------------
+DEPOSIT_CHAIN_ID: 3
+DEPOSIT_NETWORK_ID: 3
+DEPOSIT_CONTRACT_ADDRESS: 0x6f22fFbC56eFF051aECF839396DD1eD9aD6BBA9D

common/eth2_network_config/built_in_network_configs/ropsten/deploy_block.txt

@@ -0,0 +1 @@
+12269949