Create a blog post about HydraConfigLoader

We can share some of the code developed internally and explain the steps needed to create a plugin. With the intent that other teams would find it useful, create their own plugin, and maybe even open-source it for others.

https://github.com/kedro-org/kedro/issues/1303 for background and also on Slack (bookmarked but not shared here as it's an QB/Labs team conversation).

Start by reading the linked Kedro issue #1303 and gather the context around HydraConfigLoader and plugin creation. The work is done when a blog post explains the internally developed code and the steps other teams need to create their own plugin; no repository files or tests are named.

Written by the indexing model from the issue text.