Support file-per-flashcard parsing strategy

[cfu288]

Really nice work on this project! Been enjoying using it so far.

As a casual obsidian user, I have some projects where my markdown files are atomic (the name of the file is the key word, and the file content is the definition) instead of a long file with a lot of keywords and definitions. This would map nicely with ANKI and this tool if we could pass in another strategy as a CLI paramater or something that would handle this case.

I've started to hack this together locally and have it partially working, although it is nowhere near as clean as the rest of the project.

[ashlinchak]

Hi @cfu288
It'd be nice to have examples of markdown files and apkg files that were generated based on those markdown files. Potentially we'll be able to separate by domains, like Parser and Import or so and different strategies. It definitely will require significant changes. That's why PRs are welcome ;)