"Untrimming" of UIDs

[l0r1s]

Is your feature request related to a problem? Please describe.

At the moment, we can reduce the number of UIDs in a subnet (#1998) and it will set the MaxAllowedUids to the number of neurons we trim to, it is needed to have the inverse operation to be able to augment the MaxAllowedUids on a subnet.

Describe the solution you'd like

A single extrinsic where we check bounds correctly should be enough.

Describe alternatives you've considered

No response

Additional context

No response