Materialized queries connector

[andresgutgon]

What?

We want to allow users cache queries from their sources on disk to improve performance. The queries will be stored in parquet format and read with DuckDB. For that reason, this new connector inherits from our existing DuckDB connector. This PR starts the work in this connector to make it usable in development and writing queries to disk.

Issue ticket number and link

https://github.com/latitude-dev/latitude/issues/369

Checklist before requesting a review

• [ ] Pass Source to connectors (done in another PR)
• [ ] Implement materializedReffunction

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Latest commit: aa214ce30e6b463f7009b70d59eddfd518d3bed4

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[andresgutgon]

Re-open here https://github.com/latitude-dev/latitude/pull/417