Implement new lutaml_data command to read *.{lml | yaml | json} LutaML files with LutaML data definitions

[ronaldtse]

Part of:

• Support dynamically defined per-document data schemas through LutaML metanorma#444

Requires:

• WIP

This task is to update the metanorma-lutaml-plugin gem to expose data that is defined using LutaML models via the .to_liquid method to a Liquid template given in Metanorma, through a command called lutaml_data (refer to how to implement lutaml_express).

The command will look like this:

(If data definitions and data instances are in the same file)

[lutaml_data,{lutaml_definition_file},{root},options={...}]
----
...
----

Or:
(If data definitions and data instances are in different files)

[lutaml_data,{lutaml_definition_file},{lutaml_data_instance_file),{root},options={...}]
----
...
----

e.g.

[lutaml_data,s102_data.lml,lml,options={...}]
----
{% for check in lml.S158Checks.checks %}

=== S-102 Validation Check `{{ check.dev_id }}`

dev_id: {{ check.dev_id }}

classification: {{ check.classification.description }}

check message: {{ check.check_message }}

check description: {{ check.check_description }}

check solution: {{ check.check_solution }}

{% endfor %}
----