feat(x/ecocredit): Retire ORM

[technicallyty]

Description

adds retire method with ORM

ref: #696

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[ryanchristo]

Looks good. A few minor suggestions. Pre-approving.

[amaury1093]

LGTM.

One improvement we could do is group the credits by batch in the loop, and do store reads/writes by batch, to save some gas. But okay to leave it as is for now.