Expose NominationPools::MaxUnbonding as a pallet constant

[valentunn]

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Motivation

Since MaxUnbonding is a configurable parameter, it might not always be aliased to Staking::MaxUnlockChunks as its done in Polkadot, Kusama, and Westend runtimes. For example, Aleph Zero defines it to be different than MaxUnlockChunks. Exposing it as a pallet constant would allow clients to query metadata to get this bit of information to perform client-side checks to avoid users loosing tokens on commission for extrinsic known to fail in advance.

Request

Expose `NominationPools::MaxUnbonding as pallet constant

Solution

Annotate type MaxUnbonding: Get<u32>; with #[pallet::constant]

Are you willing to help with this request?

Yes!