Move the parsers out of the core module

[geoand]

The reason we don't want these in the core module is because not every application needs the doc parsing functionality (which adversely affects the application size). For example, a simple AiService that uses OpenAI has at least 30MB added to binary size by just including the POI and BouncyCastle dependencies.

We might need to make this module (or some derivatives of it) more explicit in the docs and / or by using conditional dependencies.

[geoand]

The second commit was actually a result of older changes so it's pretty much independent of the main change here