fix(drizzle): convert equals/not_equals to in/not_in for hasMany relationship array values

[maximseshuk]

What?

When the value is an array, converts equals → in and not_equals → not_in for relationship/upload fields in sanitizeQueryValue.

Why?

When filtering relationship fields with equals or not_equals using array values (e.g., { relatedPost: { equals: [1] } }), SQL adapters (Postgres, SQLite) throw because the = operator doesn't accept arrays.

How?

Added an Array.isArray(formattedValue) guard at the end of sanitizeQueryValue that swaps the operator when the value is an array. It runs after all type conversions (UUID validation, date formatting, ID casting) so it works with already-sanitized values. Same pattern as the existing contains → equals swap for hasMany relationships on line 248.

Also added integration tests covering equals and not_equals with array values for both hasMany and non-hasMany relationship fields.