TMKMS integration

[freshfab]

Since SignCTRL does not aim to be a KMS and currently only implements Tendermint's default file-based signer, it would greatly benefit from having support for the TMKMS. They both synergize pretty well for on-premise and co-location setups. With support for enclave signing, it will even become viable for cloud setups.

Here's a rough, high-level overview of the message flow between simd, SignCTRL and the TMKMS:

Happy Path

Request Rejected

[intertree]

Did any work ever commence on adding tmkms support?

Is this Project still in active development?

[freshfab]

I have no intentions of continuing to work on this project. Since I left blockscape, maybe ask @dee-effes if they plan on improving upon SignCTRL or not.