Allow specifying a jq file as a parameter to expose custom jq functions that would be accessible in interactive mode

[lquerel]

We heavily use JAQ in Weaver for filtering and pre-processing before the code/documentation generation phase. We’ve created a series of custom jq functions to make life easier for Weaver users. It would be interesting to reuse these custom functions directly in JNV when piping Weaver into JNV.

Example of JQ functions used in Weaver: https://github.com/open-telemetry/weaver/blob/main/defaults/jq/semconv.jq

Something like the following command line will be nice:

weaver registry resolve --format json | jnv --default-functions semconv.jq