Contentctl

This version of contentctl is now used to generate the Enterprise Security Content Update App (ESCU) for Public Release!
https://splunkbase.splunk.com/app/3449

This release removes splunk-appinspect from the tool in order to fix a bug with an issue with an underlying library (PyYAML):
https://github.com/yaml/pyyaml/issues/724

Includes a large number of changes. Most notably, this changes moves toward security_content_4.0 format which moves tests into detections. There is no longer a tests folder, just detections (and tests appear at the end).

There were also updates to contentctl.yml and the creation of a contentctl_test.yml that allows significant customization of test workflow.

Incremental Fixes
Another test of automated deployment workflow.

GHA Workflow Fix
Fix workflow error when pushing release

Initial release of contentctl tool
This release contains minor updates to the contentctl tool. Mainly, it fixes an issue encountered with installing via pip (due to an incorrect path).
This also tests automatic deployment to PyPi from Github on release.