Update mint policy allowlist after account code upgrades

[onurinanc]

Supporting updates to the policy allowlist in MintPolicyManager would let accounts add or remove permitted mint policies after deployment, for example using add_allowed_policy and remove_allowed_policy or update_allowed_policies procedures. This could improve flexibility over time, especially for accounts that may want to adopt new policies or deprecate existing ones.

However, since the accounts are not Upgradable, updating the allowlist is not meaningful since newly added allowed policies still need to exist in the deployed account code. After the account code upgradability we should consider adding procedures to update the allowed procedure roots.

The relevant discussion is here: #2559 (comment)

[onurinanc]

One other scenario I was wondering about is adding a new policy component and use its exported policy. To use it, we'd also have to update the map of allowed procedure policy roots, but I think we don't have an API for this? This may be something to add in the future. If that's correct, would be great to open an issue to track that unless it will be covered in future PRs already. Thanks!

Also mentioned by @PhilippGackstatter here: #2664