Allow metadata to be updated for open batches

[ryanchristo]

Summary

When bridging credits from Polygon to Regen, we check the project reference id and the batch contract address to determine whether a new project or a new credit batch needs to be created. The metadata for projects and vintages in the Toucan contracts are expected to change (adding more information). When this occurs, the metadata fields will not be updated on Regen.

When project metadata is updated, the admin of the project will be able to manually update the project metadata field, but with credit batches, the metadata cannot be manually updated. Should we allow metadata to be updated for "open" credit batches?

Problem Definition

The metadata for credit batches bridged from Polygon to Regen is expected to change.

Proposal

Allow metadata to be updated for "open" credit batches (i.e. add MsgUpdateBatchMetadata).

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[ryanchristo]

@clevinson @aaronc curious if you have any thoughts here and if we should include in v5.0.