feat: allow to pass additional HTTP headers in puppetdb requests

[TheMeier]

This can be useful if you want to access PuppetDB via custom authentication. Eg if you want to access PuppetDB behind an API gateway that requires oauth tokens or other custom headers.

[TheMeier]

No idea what is going on with the Windows tests. The just show This job failed nothing else

[bastelfreak]

I haven't tested it, but the changes look good to me.

[TheMeier]

works for me :D

BUNDLE_GEMFILE=/dev/openbolt/Gemfile bundle exec bolt plan run puppetdb_fact --targets myhost
Detected analytics configuration files at '/foo/.puppetlabs/bolt/analytics.yaml' and '/foo/.puppetlabs/etc/bolt/analytics.yaml'. Loading analytics configuration from '/foo/.puppetlabs/etc/bolt/analytics.yaml'. [ID: duplicate_analytics]
Starting: plan puppetdb_fact
Finished: plan puppetdb_fact in 0.23 sec
{
  "myhost": {
    "os": {
      "name": "Debian",
      "distro": {
        "id": "Debian",
        "release": {
          "full": "13.3",
          "major": "13",
          "minor": "3"
        },
        "codename": "trixie",
        "description": "Debian GNU/Linux 13 (trixie)"
      },
      "family": "Debian",
      "release": {
        "full": "13.3",