feat(commands): Add `cve` command to print a CVE record

[titpetric]

What did you implement:

The PR implements a cli API for retrieving CVE details:

# ./go-cve-dictionary cve CVE-2004-0230
{
  "CveID": "CVE-2004-0230",
  "Nvds": [
    {
      "CveID": "CVE-2004-0230",
      "Descriptions": [

It supports a list of CVEs as arguments (prints individual objects):

# ./go-cve-dictionary cve CVE-2004-0230 CVE-2005-1119 | jq -s | jq .[].CveID
"CVE-2004-0230"
"CVE-2005-1119"

It's reasonably easy to fetch the NVD (or any other DB), but hard to use in scripting jobs as it needs a running server.

Type of change

Please delete options that are not relevant.

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [x] This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce.

Checklist:

You don't have to satisfy all of the following.

• [ ] Write tests
• [ ] Write documentation
• [x] Check that there aren't other open pull requests for the same issue/feature
• [ ] Format your source code by make fmt
• [ ] Pass the test by make test
• [x] Provide verification config / commands
• [x] Enable "Allow edits from maintainers" for this PR
• [ ] Update the messages below

Is this ready for review?: YES