BLOCKED: Improve API Explorer code samples

[pepopowitz]

BLOCKED: until (a) all work mentioned below is released, and (b) we update to docusaurus v3.

Re: API Explorer code samples:

• @jonathanlukas would like to see Apache HttpClient 5 as an option in the Java code samples. (From Slack).
  • This might be possible soon, as it looks like there is active work to make it possible to extend the available languages.
• The Node samples include deprecated libraries (request and unirest).
  • This was resolved in a recent commit to the PaloAlto plugin. This should be available to us in an upcoming release.
• The Node samples should include fetch.
  • Again, this might be resolved by the x-codesamples work.

[pepopowitz]

It looks like there have recently been changes introduced in the API Explorer generator plugin, to potentially resolve some of these issues. We would need to upgrade to docusaurus@3.x (and docusaurus-openapi-docs@3.0.x) to take advantage of them.