filemanager: API should allow singular and list-based queries for the same key

[mmalenic]

The filemanager API can use [] to query for parameters that should be combined with an "or" condition. Query parameters without [] get combined into "and" conditions.

The following should be possible:

curl -H "Authorization: Bearer $TOKEN" https://file.dev.umccr.org/api/v1/s3?key=*.fastq.gz&key[]=*123*&key[]=*456*

Which could combine into a statement that looks like:

select *
from s3_object
where key like '%.fastq.gz' and (key like '%123%' or key like '%456%')

Currently this is not possible and results in a deserialization error:

"Failed to deserialize query string. Error: Multiple values for one key: \"key\""

Note, that I think the order of the query parameters shouldn't matter, so if they are out of order, keys with [] would be grouped anyway. Fixing this still won't enable complex logic that involves nesting conditions.