feat(prot): create identity sliding fee schedule [AC-3072]

Closes AC-3072. Add a sliding fee schedule for CreateIdentity transactions that charges more for shorter ADIs. The schedule is stored in dn.acme/globals and can be updated or removed after launch. The default schedule is exponential where 13 characters and below cost $5 and every character less multiplies the fee by 2 up to $20,480 for 1 character ADIs. This calculation is done after removing the .acme suffix.

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Related to AC-3072