🚀 Handle sourcegraph output, similarly to ripgrep and git grep

[dandavison]

Sourcegraph has a CLI tool https://github.com/sourcegraph/src-cli. It can produce JSON output (and can also be used to submit GraphQL queries directly). An output format reminiscent of rg --json can be produced using jq:

src search --json my-pattern | jq -c ".Results[]"