mishasizov-SK

Need to add a support of the next structure of services in DID doc: ``` "service": [ { "id": "#linkeddomains", "type": "LinkedDomains", "serviceEndpoint": { "origins": [ "https://did.rohitgulati.com/" ] } },...

For now Credential status manager uses `crypto` package to [sign a VC](https://github.com/trustbloc/vcs/blob/main/pkg/doc/vc/status/csl/csl.go#L178). [ It implies that VC](https://github.com/trustbloc/vcs/blob/main/pkg/storage/mongodbprovider/csl.go#L55) will have JSON-LD format, but not JWT (as a possible configuration of issuer...