OtlpBatchBuilder with same ResourceAttributes for entire batch

[snakefoot]

Single ScopeLogs + ResourceLogs for each batch of LogRecords (Reduce http-payload-size)

Include same resource-attributes for every batch:

• service.name - ${appdomain:format=Friendly}
• service.version - ${assembly-version:Default=}
• host.name - ${hostname}
• process.id - ${processid}
• os.type - windows / linux / unknown
• telemetry.sdk.language - dotnet
• telemetry.sdk.name - NLog.Targets.OpenTelemetryHttpTarget
• telemetry.sdk.version - 6.0.0

Include LogRecord-attributes, when possible:

• logger.name - LogEventInfo.LoggerName
• event.id - LogEventInfo.Properties["EventId"]
• event.name - LogEventInfo.Properties["EventName"]
• log.record.original - MessageTemplate - LogEventInfo.Message

Hopefully Preview2 will give a better out-of-the-box-experience.