* Adding CBO

* tidyups

* edit

* fixes from review

* Update docs/content/preview/architecture/query-layer/planner-optimizer.md

* added RBO and other details

* minor fixes

* Adding yb_reset_analyze_statistics correctly

* feedback from Mihnea

* feedback from Mihnea

* fix links

* Apply suggestions from code review

* backport

* correction

* minor edits

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Co-authored-by: Dwight Hodge <ghodge@yugabyte.com>
Co-authored-by: Dwight Hodge <79169168+ddhodge@users.noreply.github.com>