Add cast from enum to string before lowercasing in filtered query

[avaleske]

Issue #202

Addresses #202

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Description

In #257 we added lowercased the comparison in addFilters() so that it would be case-insensitive, but that broke comparisons with enum types.
To fix this, we cast all types to strings in the query

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Prototype/POC (not to merge)
• This change is a refactor/address technical debt
• This change requires a documentation update
• This change requires a SQL Script

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Checklist:

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[pfeeny5]

LGTM and fixed the issue.