feature: support for jsonc in library folder

[kewalaka]

Policy gets confusing quickly, and its not easy to keep track of the reason for why things have been done a specific way in the lib folder.

Is there any technical reason why .jsonc could not be added to the list - from a cursory glance it looks like it is just finding lines such as the following:

terraform-azurerm-caf-enterprise-scale/modules/archetypes/locals.policy_set_definitions.tf

Line 12 in 0ae0417

builtin_policy_set_definitions_from_json = local.archetype_policy_set_definitions_specified ? tolist(fileset(local.builtin_library_path, "**/policy_set_definition_*.{json,json.tftpl}")) : null

& adding the extra extensions (.jsonc & potentially .jsonc.tmpl) ?