optimization: (alan) only listen and get metatdata of committee validators

[y0sher]

Description

Mainly because message validation, our nodes gets metadata for all network vaildators (for mainnet now almost 40k), this overloads the ssv-node and the beacon node that has to track this validators, the message validation itself for all these validator messages also overloads the node.

This can work only in alan since previously having 500 validators made you listen to all network subnets hence you needed to know all validators.

Solution

• Consider to pull metadata from beacon node only about validators that are part of your listened subnets.
• Reject/ignore all messages that are not part of your subnet validators (this might happen automatically since you won't have their status and duties)