Move sql patch statement generation APIs to the sqlfmt package

[fulghum]

We have a few different APIs scattered around for generating SQL patch statements. I needed to make some functions from dolt_patch_table_function.go public to generate DDL statements for binlog support, so I moved them into the sqlfmt package and cleaned up some package import cycles along the way.

[zachmu]

LGTM

[coffeegoddd]

@fulghum DOLT

comparing_percentages
100.000000 to 100.000000

version	result	total
fafed52	ok	5937457

version	total_tests
fafed52	5937457

correctness_percentage
100.0

[coffeegoddd]

@fulghum DOLT

comparing_percentages
100.000000 to 100.000000

version	result	total
2486f91	ok	5937457

version	total_tests
2486f91	5937457

correctness_percentage
100.0