Support of different meta data types

[PiffPaffM]

Is your feature request related to a problem? Please describe.
At the moment filters are defined as meta data in the finder. These meta data can only be strings. This limits the type of meta data to objects which can be described this way. An example for a new type would be date so that the user can filter it.

Describe the solution you'd like
Refactor the components so that we can support other types like date as well.

[tholor]

A few requirements:

1. Allow other types
   -- dates
   -- integer / floats
   -- bool

2. Comparison (<, >, >= ...)

3. Negation

4. Value Existence (e.g. embedding == null to get all elements where we don't have embeddings yet)

5. AND / OR (with grouping)

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed in 21 days if no further activity occurs.

[tholor]

Closing in favor of epic #1958 where we will plan & track the work