Investigate mapping of LogQL metric queries to Sigma Correlation

[mostafa]

This ticket involves reading the documentations by Sigma and Loki LogQL and try to create a plan of the supported queries to be implemented in pySigma-backend-loki.

Tasks

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1. Read Sigma Correlations PR to understand what the change does
2. Read the specification doc of the Sigma Correlations (aka. meta rules)
3. Read LogQL metric query doc to understand and investigate supported queries that map with Sigma Correlations

[mostafa]

Closed in favor of #124.