Add the Syft JSON schema version to `grype version` command

[kzantow]

What would you like to be added: Add a Syft JSON version or something similar to the grype version output.

Why is this needed: In order to understand which Syft schema version is supported by a particular Grype version.

Additional context: This was an ask by community member Behrouz Soroushian: https://anchorecommunity.slack.com/archives/C027JE5M345/p1649089630253619