cw20-base migration

[daniellarita]

Steps are:

• Store new cw20-base on mainnet (version 0.14.0: https://github.com/CosmWasm/cw-plus/releases/download/v0.14.0/cw20_base.wasm). Register new code_id.
• Migrate cw20-base instances (if any), to new code id. This requires that the migrate_admin for these instances is set. Then, this requires access to the migrate admin account / credentials. This migration has to be done manually (using tgrade tx wasm migrate).
• Update the tfi-factory contract config, trough an update_config message, to set the new code id of the cw20-base contract.
• If frontend code (tgrade-app) still has the cw20-base code_id hardcoded, that has to be changed / updated to the new cw20-base code_id as well. @abefernan for reference.

[maurolacy]

See https://github.com/confio/tgrade-app/blob/mauro-scripts/scripts/tgrade/cw20-base-testnet-contract-upgrade.sh for reference.

[ueco-jb]

After all, currently this is not needed. Leaving issue to track this in the future.