FEAT: [CLIMATE WALLET] Enable multiple derivations of retirement public key

[fizpawiz]

When doing a presentation on tokenization for a corporate client, a concern was raised that the use of a static retirement public key would allow for correlation of retirement events as having all been done by a single entity.

Need to allow both "Static" and "Pseudonymous" public keys, with the default being the pseudonymous one, where a new derivation of the public key is created each time.

Note this will have a significant impact on the verification of keys, as we'll have to test multiple possible derivations to determine if we have the matching secret key for a given public key.

[fizpawiz]

Related to #81