* DEV: Add `topic_embed_import_create_args` plugin modifier
This modifier allows a plugin to change the arguments used when creating
a new topic for an imported article.
For example: let's say you want to prepend "Imported: " to the title of
every imported topic. You could use this modifier like so:
```ruby
# In your plugin's code
plugin.register_modifier(:topic_embed_import_create_args) do |args|
args[:title] = "Imported: #{args[:title]}"
args
end
```
In this example, the modifier is prepending "Imported: " to the `title` in the `create_args` hash. This modified title would then be used when the new topic is created.
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