Idea: Parse URI for Dandiset info

@yarikoptic proved it is possible to submit a request to the S3 bucket for an asset and add `&dandiset_id=XYZ` to the URI

This could be used by the log processing tool to automatically grant attribution of the request to the Dandiset ID, which removes any potential for ambiguity that usually ends up in the 'unassociated' or 'undetermined' tags

The issue names the log processing tool, S3 asset requests, and the `dandiset_id` URI parameter, but no repository files or tests. Start by tracing how request URIs become attribution tags; done means requests carrying the parameter are attributed to that Dandiset rather than marked unassociated or undetermined.

Written by the indexing model from the issue text.