Add impact and cvs3 score

[mtruj013]

Done

• Added impact and updated cvs3 score (see issue for context)

QA

• Check out this feature branch
• Run the site using the command ./run serve
• View the site locally in your web browser at: http://0.0.0.0:8030/security/api/docs#/default/get_security_cves_json
• See that tests are passing and that the schema matches what was requested

Issue / Card

Fixes https://github.com/canonical/ubuntu-com-security-api/issues/111

[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (main@819911f). Click here to learn what that means. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #113   +/-   ##
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  Coverage        ?   80.91%           
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  Files           ?       25           
  Lines           ?     1242           
  Branches        ?        0           
=======================================
  Hits            ?     1005           
  Misses          ?      237           
  Partials        ?        0           

Flag	Coverage Δ
python	80.91% <0.00%> (?)

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