[BIP-68] Enable wstETH/LDO Gauge [Ethereum]

[0xMaha]

@solarcurve

In addition, any LDO collected by the ProtocolFeeCollector would also be used to bribe for votes on this pool. There is a small LDO pool which contributes regular protocol fees so this will allow Balancer to boostrap initial liquidity and kickstart the flywheel here.

Same comment as the rETH/RPL post