Assume lowercase database object names

[aut0clave]

From https://docs.aws.amazon.com/athena/latest/ug/tables-databases-columns-names.html

Athena accepts mixed case in DDL and DML queries, but lower cases the names when it executes the query.

Macros athena__list_relations_without_caching and athena__get_columns_in_relation wrap references to information_schema.table_schema and information_schema.table_name in LOWER(), which I think is unnecessary.

In my testing, the queries executed by these macros perform significantly faster when LOWER() is removed from the information_schema references.

Macro	Seconds to run with LOWER()	Seconds to run without LOWER()
list_relations_without_caching	29.6	12.3
get_columns_in_relation	17.5	0.5