ingest git versions from OSS-Fuzz

[ziadhany]

OSS-Fuzz uses the OSV schema, the problem is that most of the versions are the Git version. #897
For example this: https://github.com/google/oss-fuzz-vulns/blob/74db2f2bc96e82a54e371e940384c825bcb32de4/vulns/openexr/OSV-2021-1420.yaml

  - type: GIT
    repo: https://github.com/AcademySoftwareFoundation/openexr
    events:
    - introduced: 40eb606dc5e8b04b7634f8a4a15f44b4e2044191
    - fixed: f68dc195ef2079793e2ea68f089adca902f0a4d8
    - fixed: e86910cb1fa2cd4e555bdb3c04b69eda28c74547
    - introduced: 57b05e055c7065ac5873f64e42350449be1eccb8
    - fixed: 666e2064d10445c501d48544d2d4566c304015c7

  database_specific:
    fixed_range: 481bde4b2584ef018cca4a6538062efd0d5d0b88:e86910cb1fa2cd4e555bdb3c04b69eda28c74547

https://ossf.github.io/osv-schema/#affectedrangestype-field

aboutcode-org/univers#85