allow artifact upload to handle windows event logs

[mmguero]

Currently the upload interface allows for uploading:

• PCAP files
• archive files (zip, tar.gz, etc.) containing Zeek logs

Although this departs a bit from Malcolm's bread-and-butter of network traffic, it's been requested by some users to allow the upload of files containing windows event logs, which should be processed similar to if they had been forwarded by fluent-bit.

Things to figure out:

• what file format are the windows event logs in
• adding a third path (right now it's just PCAP goes on way, zeek logs go the other)
• changing the documentation and UI for upload to indicate that these file types are also allowed
• parsing of these events and hooking into the same code used to parse what's generated by fluent-bit
• is there any way the source of the event logs? possibly tangentially related to handle multiple NetBox sites #449

[mmguero]

• we'll support EVTX formatted files
• this tool will do the conversion

[mmguero]

Marking as "done" for now. There are things for future improvements, which we can talk about and track in other issues. Some of these might include:

• tying to NetBox devices (based on the hostname/computer name I'd assume)
• identifying Site (handle multiple NetBox sites #449)
• more and/or improved dashboards