Deprecate marker supply query

[Taztingo]

Summary

The marker supply does not correctly output the total supply of a marker, and the correct functionality is already provided by the bank total query. It should be deprecated and later removed.

Problem Definition

There are two problems with this command. The first being that it is returning the initial supply rather than the total supply of a marker. The second issue is that the correct functionality already exists in another command. It does not make sense to have to manage and support this command.

Proposal

Deprecate the marker supply command.

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[iramiller]

This value is actually a "Target Supply" and is used when setting up a marker ... it shouldn't be used for non-fixed supply markers after they are activated since it doesn't apply anymore. The amount in circulation is always available from the bank which is a [potentially] different value.

For a "fixed supply" marker this value always applies and the invariant will mint/burn as required to pull the token into alignment with this configured supply target amount.

[hyperschwartz]

In some projects, I've found value in knowing the initial supply of a marker. It would be nice to have a new initial_supply field for referencing the value currently named supply on the MarkerAccount proto, if possible.