Introduce the jade framework for writing PVM programs

[clearloop]

Jade which is the framework for JAM programs, have three components, jade (wrapped syntax), jat (the testing environment) and cargo-jam

Jade - Wrapped syntax

wrap the interfaces of jam-pvm-build into developer friendly syntax

Jat - Testing environment

1. a PVM executor which could be extracted from our pvmi
2. introduce environment for the onchain state, could be just a key-value memory db HashMap<Vec<u8>, Vec<u8>>
3. while in this environment, we also need interfaces to modify the state of existing service accounts

cargo-jam

compile the program and run tests, 3 commands as the minimal implementation:

1. cargo jam new
2. cargo jam build
3. cargo jam test