feat: add synced_block support

[SpyrexDE]

For me, the most effective way to make up-to-date flash cards using Notion is using synced_blocks. It would be really helpful to be able to use synced_blocks within flash cards.

[aalemayhu]

@SpyrexDE can you elaborate on how you expect it to work?

[aalemayhu]

I want to make sure I understand the feature requests.

[SpyrexDE]

Well, it should just use the content of the synced block to put on the flash cards.

[22-modifier]

@SpyrexDE Workaround:
Synced blocks do seem to work if the information contained within them is just a single block that doesn't have any hierarchy (can be either text or bullets). If you need multiple lines, you can use Shift + Enter to keep it within the same block and it still works.

Testing to show what does and doesn't work - Notion page can be duplicated
Notion link: https://www.notion.so/2g-ancef/__Test-Cherry-Avocado-5825c8bfe80540a69dbe99c8c1858d34?pvs=4
Video (screencapture): https://capture.dropbox.com/jd9K457MZqweKyY6

Desired functionality:
Example how Notion looks (ideally want the synced text [red box] to show up in both cards):

2Anki output for cards shown above - only the "original" synced block makes it into the card.

Synced block information missing in the 2nd card:

[aalemayhu]

Expected behaviour

[github-actions]

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