security-vocab v3 context splitting

[OR13]

I have created:

• https://w3id.org/pgp/v1
• https://github.com/OR13/lds-pgp2021
• https://or13.github.io/lds-pgp2021/#PgpVerificationKey2021

As an example of splitting out context definitions...

perhaps we can find a way to adjust

security/v3 to include https://w3id.org/pgp/v1 and https://w3id.org/bbs/v1 in the future.

[OR13]

@kdenhartog @tplooker now that we have ci tests, we should proceed to finding a better way to code split sec/v3

[OR13]

related: w3c/vc-di-bbs#41

[OR13]

There are now:

• https://w3id.org/pgp/v1
• https://w3id.org/jws/v1
• https://w3id.org/bbs/v1

Each defines only what is needed for the suites

[OR13]

perma-id/w3id.org#1980