Returns:
    A string containing:
    - Current activation queue length (number of validators waiting to activate)
    - Total active validators
    - Total balance of entering validators in ETH
    - Estimated wait time (based on ~900 activations per day)

Returns:
    A string containing:
    - Current exit queue length (number of validators waiting to exit)
    - Total active validators
    - Total balance of exiting validators in ETH
    - Estimated wait time (based on ~900 exits per day)

Args:
    pubkey (str): The public key of the validator (48-byte hex string starting with '0x')

Returns:
    A string containing:
    - Validator public key
    - Current status (e.g., active_online, pending, exited)
    - Effective balance in ETH
    - Activation epoch (if applicable)
    - Exit epoch (if applicable)