[Microsoft Sentinel Intel] Batch processing of stream events and batch uploading of indicators

[romain-filigran]

Use case

At the moment, the "Microsoft Sentinel Intel' connector upload indicator one by one in Microsoft Sentinel.
This behavior causes rate limit issues as the limits defined by microsoft are

• Maximum of 1000 indicators per request
• Maximum of 100 requests per minute per workspace

We introduce a method in the Python client to process stream events in batches. Once the PR (OpenCTI-Platform/client-python#1022) is merged, we need to implement this behavior at the connector level.