Update testnet configs, change on-disk format (#1799)

## Issue Addressed

- Related to #1691

## Proposed Changes

- Add `DEPOSIT_CHAIN_ID` and `DEPOSIT_NETWORK_ID` to `config.yaml`.
    - Pass the `DEPOSIT_NETWORK_ID` to the `eth1::Service`.
- Remove the unused `MAX_EPOCHS_PER_CROSSLINK` from the `altona` and `medalla` configs (see [spec commit](2befe90032 (diff-efb845ac2ebd4aafbc23df40f47ce25699255064e99d36d0406d0a14ca7953ec))).
- Change from compressing the whole testnet directory, to only compressing the genesis state file. This is the only file we need to compress and *not* compressing the others makes them work nicely with git.
    - We can modify the boot nodes, configs, etc. without incurring an eternal binary-blob cost on our git history.
    - This change is backwards compatible (i.e., non-breaking).

## Additional Info

NA

common/eth2_testnet_config/built_in_testnet_configs/medalla/boot_enr.yaml

@@ -0,0 +1,10 @@
+- enr:-LK4QKWk9yZo258PQouLshTOEEGWVHH7GhKwpYmB5tmKE4eHeSfman0PZvM2Rpp54RWgoOagAsOfKoXgZSbiCYzERWABh2F0dG5ldHOIAAAAAAAAAACEZXRoMpAAAAAAAAAAAAAAAAAAAAAAgmlkgnY0gmlwhDQlA5CJc2VjcDI1NmsxoQOYiWqrQtQksTEtS3qY6idxJE5wkm0t9wKqpzv2gCR21oN0Y3CCIyiDdWRwgiMo
+- enr:-LK4QEnIS-PIxxLCadJdnp83VXuJqgKvC9ZTIWaJpWqdKlUFCiup2sHxWihF9EYGlMrQLs0mq_2IyarhNq38eoaOHUoBh2F0dG5ldHOIAAAAAAAAAACEZXRoMpAAAAAAAAAAAAAAAAAAAAAAgmlkgnY0gmlwhA37LMaJc2VjcDI1NmsxoQJ7k0mKtTd_kdEq251flOjD1HKpqgMmIETDoD-Msy_O-4N0Y3CCIyiDdWRwgiMo
+- enr:-KG4QIOJRu0BBlcXJcn3lI34Ub1aBLYipbnDaxBnr2uf2q6nE1TWnKY5OAajg3eG6mHheQSfRhXLuy-a8V5rqXKSoUEChGV0aDKQGK5MywAAAAH__________4JpZIJ2NIJpcIQKAAFhiXNlY3AyNTZrMaEDESplmV9c2k73v0DjxVXJ6__2bWyP-tK28_80lf7dUhqDdGNwgiMog3VkcIIjKA
+- enr:-Ku4QLglCMIYAgHd51uFUqejD9DWGovHOseHQy7Od1SeZnHnQ3fSpE4_nbfVs8lsy8uF07ae7IgrOOUFU0NFvZp5D4wBh2F0dG5ldHOIAAAAAAAAAACEZXRoMpAYrkzLAAAAAf__________gmlkgnY0gmlwhBLf22SJc2VjcDI1NmsxoQJxCnE6v_x2ekgY_uoE1rtwzvGy40mq9eD66XfHPBWgIIN1ZHCCD6A
+- enr:-Ku4QOzU2MY51tYFcoByfULugCu2mepfqAbB0DajbRzg8xlILLfi5Iv_Wx-ARn8SiFoZZb3yp2x05cnUDYSoDYZupjIBh2F0dG5ldHOIAAAAAAAAAACEZXRoMpAYrkzLAAAAAf__________gmlkgnY0gmlwhBLf22SJc2VjcDI1NmsxoQLEq16KLm1vPjUKYGkHq296D60i7y209NYPUpwZPXDVgYN1ZHCCD6A
+- enr:-Ku4QOYFmi2BW_YPDew_CKdfMvsrcRY1ARA-ImtcqFl-lgoxOFbxte4PU44-1M3uRNSRM-6rVa8USGohmWwtgwalEt8Bh2F0dG5ldHOIAAAAAAAAAACEZXRoMpAYrkzLAAAAAf__________gmlkgnY0gmlwhBLf22SJc2VjcDI1NmsxoQKH3lxnglLqrA7L6sl5r7XFnckr3XCnlZMaBTYSdE8SHIN1ZHCCD6A
+- enr:-LK4QC3FCb7-JTNRiWAezECk_QUJc9c2IkJA1-EAmqAA5wmdbPWsAeRpnMXKRJqOYG0TE99ycB1nOb9y26mjb_UoHS4Bh2F0dG5ldHOIAAAAAAAAAACEZXRoMpDnp11aAAAAAf__________gmlkgnY0gmlwhDMPYfCJc2VjcDI1NmsxoQOmDQryZJApMwIT-dQAbxjvxLbPzyKn9GFk5dqam4MDTYN0Y3CCIyiDdWRwgiMo
+- enr:-LK4QLvxLzt346gAPkTxohygiJvjd97lGcFeE5yXgZKtsMfEOveLE_FO2slJoHNzNF7vhwfwjt4X2vqzwGiR9gcrmDMBh2F0dG5ldHOIAAAAAAAAAACEZXRoMpDnp11aAAAAAf__________gmlkgnY0gmlwhDMPRgeJc2VjcDI1NmsxoQPjXTGx3HkaCG2neFxJmaTn5eCgbra3LY1twCeXPHChL4N0Y3CCIyiDdWRwgiMo
+- enr:-Ku4QFVactU18ogiqPPasKs3jhUm5ISszUrUMK2c6SUPbGtANXVJ2wFapsKwVEVnVKxZ7Gsr9yEc4PYF-a14ahPa1q0Bh2F0dG5ldHOIAAAAAAAAAACEZXRoMpAYrkzLAAAAAf__________gmlkgnY0gmlwhGQbAHyJc2VjcDI1NmsxoQILF-Ya2i5yowVkQtlnZLjG0kqC4qtwmSk8ha7tKLuME4N1ZHCCIyg
+

common/eth2_testnet_config/built_in_testnet_configs/medalla/config.yaml

@@ -0,0 +1,58 @@
+MAX_COMMITTEES_PER_SLOT: 64
+TARGET_COMMITTEE_SIZE: 128
+MAX_VALIDATORS_PER_COMMITTEE: 2048
+MIN_PER_EPOCH_CHURN_LIMIT: 4
+CHURN_LIMIT_QUOTIENT: 65536
+SHUFFLE_ROUND_COUNT: 90
+MIN_GENESIS_ACTIVE_VALIDATOR_COUNT: 16384
+MIN_GENESIS_TIME: 1596546000
+HYSTERESIS_QUOTIENT: 4
+HYSTERESIS_DOWNWARD_MULTIPLIER: 1
+HYSTERESIS_UPWARD_MULTIPLIER: 5
+SAFE_SLOTS_TO_UPDATE_JUSTIFIED: 8
+ETH1_FOLLOW_DISTANCE: 1024
+TARGET_AGGREGATORS_PER_COMMITTEE: 16
+RANDOM_SUBNETS_PER_VALIDATOR: 1
+EPOCHS_PER_RANDOM_SUBNET_SUBSCRIPTION: 256
+SECONDS_PER_ETH1_BLOCK: 14
+DEPOSIT_CONTRACT_ADDRESS: 0x07b39F4fDE4A38bACe212b546dAc87C58DfE3fDC
+MIN_DEPOSIT_AMOUNT: 1000000000
+MAX_EFFECTIVE_BALANCE: 32000000000
+EJECTION_BALANCE: 16000000000
+EFFECTIVE_BALANCE_INCREMENT: 1000000000
+GENESIS_FORK_VERSION: 0x00000001
+BLS_WITHDRAWAL_PREFIX: 0x00
+GENESIS_DELAY: 172800
+SECONDS_PER_SLOT: 12
+MIN_ATTESTATION_INCLUSION_DELAY: 1
+SLOTS_PER_EPOCH: 32
+MIN_SEED_LOOKAHEAD: 1
+MAX_SEED_LOOKAHEAD: 4
+EPOCHS_PER_ETH1_VOTING_PERIOD: 32
+SLOTS_PER_HISTORICAL_ROOT: 8192
+MIN_VALIDATOR_WITHDRAWABILITY_DELAY: 256
+SHARD_COMMITTEE_PERIOD: 256
+MIN_EPOCHS_TO_INACTIVITY_PENALTY: 4
+EPOCHS_PER_HISTORICAL_VECTOR: 65536
+EPOCHS_PER_SLASHINGS_VECTOR: 8192
+HISTORICAL_ROOTS_LIMIT: 16777216
+VALIDATOR_REGISTRY_LIMIT: 1099511627776
+BASE_REWARD_FACTOR: 64
+WHISTLEBLOWER_REWARD_QUOTIENT: 512
+PROPOSER_REWARD_QUOTIENT: 8
+INACTIVITY_PENALTY_QUOTIENT: 16777216
+MIN_SLASHING_PENALTY_QUOTIENT: 32
+MAX_PROPOSER_SLASHINGS: 16
+MAX_ATTESTER_SLASHINGS: 2
+MAX_ATTESTATIONS: 128
+MAX_DEPOSITS: 16
+MAX_VOLUNTARY_EXITS: 16
+DOMAIN_BEACON_PROPOSER: 0x00000000
+DOMAIN_BEACON_ATTESTER: 0x01000000
+DOMAIN_RANDAO: 0x02000000
+DOMAIN_DEPOSIT: 0x03000000
+DOMAIN_VOLUNTARY_EXIT: 0x04000000
+DOMAIN_SELECTION_PROOF: 0x05000000
+DOMAIN_AGGREGATE_AND_PROOF: 0x06000000
+DEPOSIT_CHAIN_ID: 5
+DEPOSIT_NETWORK_ID: 5

common/eth2_testnet_config/built_in_testnet_configs/medalla/deploy_block.txt

@@ -0,0 +1 @@
+3085928

common/eth2_testnet_config/built_in_testnet_configs/medalla/deposit_contract.txt

@@ -0,0 +1 @@
+0x07b39F4fDE4A38bACe212b546dAc87C58DfE3fDC