Add support for JSON-RPC Bugzilla API

[jamacku]

Type of issue

Feature Request

Description

Red Hat Bugzilla documentation of JSON-RPC: link

Describe the solution you'd like

Example of adding an external tracker:

await fetch(`${bzInstance}/jsonrpc.cgi`, {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
      Authorization: `Bearer ${bzAPIToken}`,
    },
    body: JSON.stringify({
      jsonrpc: '1.0',
      method: 'ExternalBugs.add_external_bug',
      params: [
        {
          bug_ids: [2013411],
          external_bugs: [
            {
              ext_type_url: 'https://github.com/',
              ext_bz_bug_id: `${owner}/${repo}/pull/${prMetadata.number}`,
            },
          ],
        },
      ],
      id: 'identifier',
    }),
  });