Test heimdall2 xccdf to ckl conversion

Background

If we're not able to successfully import a stigviewer xml in #858 (closed), we should test using heimdall2 to convert our xccdf from oscap into a ckl file. Before this is possible, we'll need this MR to be merged into the heimdall2 project.

To convert the xccdf file into a ckl, we'll need to:

• Convert xccdf to hdf
• Convert hdf to ckl

Commands for converting between these formats can be found here

Acceptance Criteria

• Converting xccdf to ckl has been tested
• Importing the resulting ckl into stigviewer has been tested

Definition of Done

• Results of this testing have been documented in this ticket
• If successfully tested
  • Any pertinent information is documented in this ticket and communicated to CHT
  • An issue is made to add this output to the pipeline (if applicable)