Token contract upgrade (#1)

* remove CI files

* rename crate

* update docker images

* add module for legacy support

* add old append_store from secret_toolkit, modified for cosmwasm v1

* add custom viewing_key implementation

* use latest versions of dependencies

* add migrate function

* merge new and old versions of transaction_history

* merge new and old versions of state- use PrefixedStorage and CanonicalAddr

* add storage key namespace explanation

* make 'should_filter_decoys' optional (default to false)

* use old-style state functions, CanonicalAddr everywhere

* clippy, doc comments

* add some unique amber features

* generate new schema

* fix: can't save prng_seed before Constants exist

* update Cargo.lock

* add ability to regenerate one amber code

* fix: include address bytes as entropy to avoid code duplication

Author: kent-3