feat: vesting delegator actions + ABI

[MuncleUscles]

Tooling-wave: vesting delegator lifecycle (vestingDelegatorJoin/Exit/Claim, vestingWithdraw, vestedAmount) + views, mirroring the staking module. Vesting-VALIDATOR leg stubbed pending consensus #1154. Unit tests mock the transport. Part of the vesting tooling train — CLI vesting commands depend on this.

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