define schema for dolt_schemas table

[jennifersp]

dolthub/doltgresql#454 depends on this PR.

[zachmu]

I don't think this is the right approach.

The dolt_schemas table defines elements like views and triggers for tables in the database. It follows that we should have a dolt_schemas table in every database schema, to define the views etc. for that schema.

This is required to address e.g. dolthub/doltgresql#456

So this method needs to change: it need to specify a schema string (empty in the case of dolt).

[github-actions]

Additional work is required for integration with DoltgreSQL.

[coffeegoddd]

@jennifersp DOLT

comparing_percentages
100.000000 to 100.000000

version	result	total
0f6d6cc	ok	5937457

version	total_tests
0f6d6cc	5937457

correctness_percentage
100.0

[github-actions]

Additional work is required for integration with DoltgreSQL.

[coffeegoddd]

@jennifersp DOLT

comparing_percentages
100.000000 to 100.000000

version	result	total
e6f9398	ok	5937457

version	total_tests
e6f9398	5937457

correctness_percentage
100.0

[github-actions]

Additional work is required for integration with DoltgreSQL.

[coffeegoddd]

@jennifersp DOLT

comparing_percentages
100.000000 to 100.000000

version	result	total
be3893a	ok	5937457

version	total_tests
be3893a	5937457

correctness_percentage
100.0

[Hydrocharged]

Tests pass, but the part highlighted in the comment doesn't seem quite right.

[github-actions]

Additional work is required for integration with DoltgreSQL.

[coffeegoddd]

@jennifersp DOLT

comparing_percentages
100.000000 to 100.000000

version	result	total
7a84e8c	ok	5937457

version	total_tests
7a84e8c	5937457

correctness_percentage
100.0