Support Chinese GM algorithm

[chaunsin]

I hope to support the GM algorithm of China or reserve an interface. In the process of use, I need to replace the algorithm architecture and modify the SDK, CA and peer services, which is very invasive to the code. In addition, the above process needs to be repeated in the version upgrade, resulting in a lot of repetitive labor.

[Varorbc]

@bestbeforetoday Any updates?

[bestbeforetoday]

I think this is very closely related to this Fabric RFC: hyperledger/fabric-rfcs#34. Probably the right approach is to refactor the Fabric crypto implementation so that it is more easily pluggable, as described in that RFC.

As you can see from PR #3343, just to implement ed25519 support as an alternative to ECDSA, there is a lot of work involved for every new crypto implementation with the current codebase, and then that implementation is baked into the core Fabric code and needs to be supported there.

Please note that I am not a maintainer of this repository. @denyeart and the other @hyperledger/fabric-core-maintainers might have different or better informed views.