v0.5.0

Features:

• Implement source, target and head monitoring.
• Implement full compatibility with Prysm >= 4.0.8

Bug fixes:

• Fix crash with entry queue estimation with the number of validators exceeds 1_310_720 (new limit: 2_621_440)
• Allow to run the watcher for pre-genesis network.
• Fix crash due to looking into negatives slots/epochs during the first 2 epochs of network.
• Entry queue estimation: Fix estimation jump at churn change.
• Increase MISSED_BLOCK_TIMEOUT_SEC from 9 sec to 10 sec to avoid missed blocks false positives