Extension resource: `azurerm_monitor_data_collection_rule_association` not discovered

[magodo]

The azurerm_monitor_data_collection_rule_association is different than the other _association resources, in that it is a real azure resource, whilst it is an extension resource that can be derived in a couple of different resource types. This is similar to role assignment resources (also is an extension resource). The way we are handling the extension resource in terms of discoverability is to use instruct azlist to try to list the specified extension resource types, which can cause performance downgrade. Hence we let the user to decide whether to include a certain type of extension resource, via --include-role-assignment. This means we probably need to introduce a similar option --include-monitor-data-collection-rule-association for this case (the option is so long..). Apparently, this is not a scalable way to handle that. Instead, we probably shall consider to introduce an option --include-extension-resource="rt1,rt2" to ask the users to specify that extension resources (as how aztfexport calls azlist). Though this can be tedius and hard to use.

Besides, the current ARM schema file doesn't include the record for this resource type, which is tracked by Azure/azure-resource-manager-schemas#3526.