Filter support

[galeaspablo]

Please add filter support, but please don't define filters as an extra entity in the configuration.yml. Simply add an optional field to each data_destination's data source, where we can pass a filter predicate string. The filter should work just like it does on Ambar proper according to docs.ambar.cloud

This is not a priority right now, so it can wait for #15 to be completed (#15 in turn has to wait for other issues to be completed first). And we should also do this after serverless. I.e., filter support is likely an item for December 2024 / Jan 2025.