beacon-APIs
                                
                                
                                
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                        Add `eventstreamV2`
We need to communicate fork version during attestation and attester_slashing since it is modified by EIP-7549.
For example, "aggregation_bits":"0x01" will mean different validators in pre and post-EIP-7549.
This PR adds eventstreamV2 which has version in attestation and attester_slashing
Related to #445