* feat: fetch metrics from system tables
* feat: add permission doc for fetching metrics from system tables
* feat: fix E2E tests to reflect full table row count after table metric update
* feat: ran linting
* feat: fix doc string engine name + function typing
* feat: ran python linting
* fix: optimize system metrics retrieval for memory
* fix: ran python linting
* fix: logic to retrieve unique system metrics operations
* fix: added logic to clean up query before parsing it
* fix: added E2E tests for rds, bq, snflk system metrics
* fix: ran python linting
* fix: fix postgres query + add default byte size to env var
* fix: ran python linting