Allow `is_span` and `is_audio_span` to process entries in primitive form

**Is your feature request related to a problem? Please describe.**
Currently, the `in_span` and `in_audio_span` methods only handle entries of type `Union[int, Entry]`. We want to allow these methods to also handle entries that are stored in a dictionary form according to the interface suggested in #900.

**Describe the solution you'd like**
There are two ways in which this problem can be approached.

1. Modify each conditional branch of the methods to handle entries of the type `Dict[str, Any]`
2. Create new methods `in_span_raw` and `in_audio_span_raw` which would specifically be focused on handling entries of type `Dict[str,Any]`.

Start by locating the `in_span` and `in_audio_span` methods and read issue #900 for the proposed dictionary interface. Determine whether the existing methods or new raw variants should accept `Dict[str, Any]`; done means primitive-form entries work for both span types without breaking existing `int` and `Entry` inputs.

Written by the indexing model from the issue text.