textproc/py-evtx2splunk: New port: Evtx to Splunk ingestor

Ingest EVTX files into a Splunk instance.

This tool is based on the work of :

Omer BenAmram
Blardy
Thanks to Ekto for its contribution.

Key features:

• Splunk HEC support with token auto-creation
• Splunk index auto-creation
• Multiprocessing support
• Caching for evtx reuse without reconverting
• Windows and Linux compatibility
• Rely on the great and fast evtx_dump Rust tool of Omer
• Evtx message resolutions from database

Note: evtx2splunk converts the EVTX to JSON and stores them in a temporary
place. Hence, up to the size of source EVTX can be created during the process.
These files are removed at the end of the process, except if keep_cache is
enabled.