[Monitor Ingestion] Add typespec files

[pvaneck]

WIP Migration of Monitor Logs Ingestion swagger to TypeSpec.

[openapi-pipeline-app[bot]]

Next Steps to Merge

✅ All automated merging requirements have been met! To get your PR merged, see aka.ms/azsdk/specreview/merge.

[openapi-pipeline-app[bot]]

PR validation pipeline restarted successfully. If there is ApiView generated, it will be updated in this comment.

[pvaneck]

@srnagar Would be good to get your input on this as well! :)

[github-actions[bot]]

API Change Check

APIView identified API level changes in this PR and created the following API reviews

Language	API Review for Package
Java	com.azure:azure-monitor-ingestion
Python	azure-monitor-ingestion
Swagger	ingestion-ingestion
TypeSpec	LogsIngestion
JavaScript	@azure/monitor-ingestion