Removes standalone agent functionality, and prepares the new repo for its first release.

[djaglowski]

• Module name now matches repo name exactly, so it can be imported elsewhere
• Prepare changelog for an initial release
• Removes standalone agent functionality
• Simplifies modules
  • Combines parser/syslog and input/windows modules into the primary module
  • Removes output operators that were previously separate modules
  • Leaves input/k8sevent and transformer/k8smetadata as separate modules for now. These two have extensive dependencies and their usefulness in the collector needs to be discussed before merging or removing.