Consider making storage tiering operations invocable from other REPs

[alanking]

Currently, the storage tiering rule can only be run as a JSON object submitted to the REP. It could be useful to expose some of the operations so that they can be invoked from other REPs (such as native rule language).

Here is a demonstration of how this might look if modeled after logical quotas REP: https://github.com/irods/irods_rule_engine_plugin_logical_quotas?tab=readme-ov-file#invoking-operations-via-the-native-rule-language