Write stats to disk and dolt_statistics table (#7243)

* Write statistics to prolly tree

* fix go-sql-server-driver

* [ga-format-pr] Run go/utils/repofmt/format_repo.sh and go/Godeps/update.sh

* bump

* [skip actions] [ga-update-correctness] SQL Correctness updated to 99.997709

* Tidy

* test edits

* fix string outputs

* fix string printing histogram rows

* bump

* [skip actions] [ga-update-correctness] SQL Correctness updated to 99.998097

* test bump

* bump

* bump

---------

Co-authored-by: max-hoffman <max-hoffman@users.noreply.github.com>
Co-authored-by: coffeegoddd <coffeegoddd@users.noreply.github.com>

.github/scripts/sql-correctness/current_correctness.txt

@@ -1 +1 @@
-99.997743
+99.998097