Migrate FSC support files into our repo

The Fabric Smart Client (FSC) has support for FPC. This allows users to run FPC chaincode with FSC applications / tests / experiments / prototypes. Great thing! We provide a deployment samples and the IRB demo using FSC.

However, the FPC support requires FSC to import parts of the FPC client SDK. This somewhat introduces a cyclic dependency. Ideally, we can cut this and host the FPC extension for FPC in our repository as a submodule. This Issue proposes to migrate the FPC related FSC code into our repository.

Users of FSC that wish to use FPC, can just simply import the FSC as core and our extension, injecting it via the `topology.go`.

Tasks:

- [ ] Remove FPC related code from FSC. See this PR https://github.com/hyperledger-labs/fabric-smart-client/pull/696
- [ ] Create an extension submodule in migrate the code
- [ ] Update samples
- [ ] simple test network
- [ ] IRB demo