feat(permission0): new wallet scope

[saiintbrisson]

Introduces a new permission type for controlling wallet stake.

Closes CHAIN-129.

[linear]

CHAIN-129 First wallet permission - Stake

[coderabbitai]

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[steinerkelvin]

This was converted by Polkadot.js to r_type, and in Serde, it would be just type. Even worse, Polkadot.js usually converts the fields to camel case, and in this case, there's this underscore _.

I think it's better for us to avoid using type or other keywords as identifiers if this is going to happen, to avoid inconsistencies in serialization/conversion at interfaces.

Alternatives: kind, variant, body.

[steinerkelvin]

Addressed by: #148