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/altona/boot_enr.yaml

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+- enr:-LK4QPVkFd_MKzdW0219doTZryq40tTe8rwWYO75KDmeZM78fBskGsfCuAww9t8y3u0Q0FlhXOhjE1CWpx3SGbUaU80Ch2F0dG5ldHOIAAAAAAAAAACEZXRoMpD6etXjAAABIf__________gmlkgnY0gmlwhDMPRgeJc2VjcDI1NmsxoQNHu-QfNgzl8VxbMiPgv6wgAljojnqAOrN18tzJMuN8oYN0Y3CCIyiDdWRwgiMo
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common/eth2_testnet_config/built_in_testnet_configs/altona/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: 640
+MIN_GENESIS_TIME: 1593433800
+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: 0x16e82D77882A663454Ef92806b7DeCa1D394810f
+MIN_DEPOSIT_AMOUNT: 1000000000
+MAX_EFFECTIVE_BALANCE: 32000000000
+EJECTION_BALANCE: 16000000000
+EFFECTIVE_BALANCE_INCREMENT: 1000000000
+GENESIS_FORK_VERSION: 0x00000121
+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/altona/deploy_block.txt

@@ -0,0 +1 @@
+2917810

common/eth2_testnet_config/built_in_testnet_configs/altona/deposit_contract.txt

@@ -0,0 +1 @@
+0x16e82D77882A663454Ef92806b7DeCa1D394810f