Add back ForceTransfer and minting/burning to any account to x/tokenfactory

[sunnya97]

As discussed in osmosis-labs/osmosis#1029, in the v1 of the x/tokenfactory module, we removed the ForceTransfer functionality and only allow mints/burns to be done to/from the admin account. We should eventually add these functionalities back in.

To do so, we need to conduct a review of all existing SDK code to make sure the "adding or removing of tokens" from accounts (especially module accounts) does not cause unexpected behavior or bugs. For example, what happens if an admin suddenly burns coins from the distribution module account? There's a lot of edge cases to consider.

[ValarDragon]

Why do we even need force transfer, instead of just freezing an address?

The following seems equivalent to a force transfer of tokens C, from A to B:

• Freeze denom C for address A
• Mint new tokens C, and deposit in address B
• Adjust bank supply offsets for C

[sunnya97]

Well, if we want to more closely match the functionality that CW20 tokens have, they are able to remove tokens from accounts, not just freeze them.

Also, even if we only enable arbitrary freezing, we still have to conduct the same audit to make sure that doesn't break anything.