Add the ability to use a jq module for custom functions in jq-template

[LaurentGoderre]

This works by creating a ./jq-template.jq at the same level as the jq-template.awk. A standard jq-template.jq can then be pulled which contain shared function or templates to use across DOI

If checks at the same location as the awk file for a jq module called jq-template.jq. If the modules it loads it to extend the templating function with custom jq functions and filters

[codecov-commenter]

Codecov Report

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[yosifkit]

I'm not certain we should auto-include other jq files. I think that if each repo's apply-templates scripts will already need to opt-in to grab an extra jq helper functions file, then it'd be better to just make them also include it in their Dockerfile templates that use it. It'll make it clearer where any extra functions that aren't defined locally come from.

We have a repo-local shared.jq file used across multiple templates in docker: cli, dind, and dind-rootless.