This fixes failures in event handling on Windows 2022[1] where parts of
events available from the Windows API are not reflected in the events
recovered by winlogbeat[2].

There is unfortunately quite a lot of movement in this change due to the
need to satisfy linter requirements. Beyond those changes, the substantive
changes here are:

1. Addition of new testing infrastructure to allow addition of evtx files
   and comparison with there expected XML renderings, and adding some test
   cases (shown below).
2. Fixing a buffer length parameter in the call to _EvtFormatMessage in
   evtFormatMessage that was the result of a lack of clarity in the API
   documentation for that syscall.
3. Fixing a var shadowing decl of the publisher handle EvtHandle in
   FormatEventString.
4. Providing a call back for the legacy (non-experimental) API through
   wineventlog.Message to allow it to obtain the event message in the case
   that the RenderingInfo element is not available via the Windows API.
5. Ensure that keyword, opcode and level are obtained by the non-experimental
   API by calling winevent.EnrichRawValuesWithNames in buildRecordFromXML.
   This change also required making winevent.Event.OpcodeRaw a pointer to
   allow an absent System>Opcode element to be distinquished from the zero,
   but present element.

The change also enables testing on Windows 2022.

[1]#30621
[2]#30622 (comment)

New events in testing as rendered by the Event Viewer:

ec1: eventcreate /id 1000 /t error /l application /d "My custom error event for the application log"

- <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
    - <System>
          <Provider Name="EventCreate" />
          <EventID Qualifiers="0">1000</EventID>
          <Version>0</Version>
          <Level>2</Level>
          <Task>0</Task>
          <Opcode>0</Opcode>
          <Keywords>0x80000000000000</Keywords>
          <TimeCreated SystemTime="2022-03-22T02:03:11.3106672Z" />
          <EventRecordID>316</EventRecordID>
          <Correlation />
          <Execution ProcessID="0" ThreadID="0" />
          <Channel>Application</Channel>
          <Computer>vagrant</Computer>
          <Security UserID="S-1-5-21-2297499104-2362337018-4092230427-1000" />
      </System>
    - <EventData>
          <Data>My custom error event for the application log</Data>
      </EventData>
  </Event>

ec2: eventcreate /id 999 /t error /l application /so WinWord /d "Winword event 999 happened due to low diskspace"

- <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
    - <System>
          <Provider Name="WinWord" />
          <EventID Qualifiers="0">999</EventID>
          <Version>0</Version>
          <Level>2</Level>
          <Task>0</Task>
          <Opcode>0</Opcode>
          <Keywords>0x80000000000000</Keywords>
          <TimeCreated SystemTime="2022-03-22T02:03:11.5132246Z" />
          <EventRecordID>317</EventRecordID>
          <Correlation />
          <Execution ProcessID="0" ThreadID="0" />
          <Channel>Application</Channel>
          <Computer>vagrant</Computer>
          <Security UserID="S-1-5-21-2297499104-2362337018-4092230427-1000" />
      </System>
    - <EventData>
          <Data>Winword event 999 happened due to low diskspace</Data>
      </EventData>
  </Event>

ec3: eventcreate /id 5 /t error /l system /d "Catastrophe!"

- <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
    - <System>
          <Provider Name="system" />
          <EventID Qualifiers="0">5</EventID>
          <Version>0</Version>
          <Level>2</Level>
          <Task>0</Task>
          <Opcode>0</Opcode>
          <Keywords>0x80000000000000</Keywords>
          <TimeCreated SystemTime="2022-03-22T02:03:11.5455572Z" />
          <EventRecordID>1413</EventRecordID>
          <Correlation />
          <Execution ProcessID="0" ThreadID="0" />
          <Channel>System</Channel>
          <Computer>vagrant</Computer>
          <Security UserID="S-1-5-21-2297499104-2362337018-4092230427-1000" />
      </System>
    - <EventData>
          <Data>Catastrophe!</Data>
      </EventData>
  </Event>

ec4: eventcreate /id 5 /t error /l system /so Backup /d "Backup failure"

- <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
    - <System>
          <Provider Name="Backup" />
          <EventID Qualifiers="0">5</EventID>
          <Version>0</Version>
          <Level>2</Level>
          <Task>0</Task>
          <Opcode>0</Opcode>
          <Keywords>0x80000000000000</Keywords>
          <TimeCreated SystemTime="2022-03-22T02:03:11.8616638Z" />
          <EventRecordID>1414</EventRecordID>
          <Correlation />
          <Execution ProcessID="0" ThreadID="0" />
          <Channel>System</Channel>
          <Computer>vagrant</Computer>
          <Security UserID="S-1-5-21-2297499104-2362337018-4092230427-1000" />
      </System>
    - <EventData>
          <Data>Backup failure</Data>
      </EventData>
  </Event>

Co-authored-by: Andrew Kroh <andrew.kroh@elastic.co>
(cherry picked from commit 34bdc3d)