feat(appkit): document streaming APIs

[novusnota]

Closes #2060

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Reviewing files that changed from the base of the PR and between 2431ff0 and 85febed.

📒 Files selected for processing (4)

• ecosystem/appkit/init.mdx
• ecosystem/appkit/jettons.mdx
• ecosystem/appkit/nfts.mdx
• ecosystem/appkit/toncoin.mdx

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[novusnota]

Let's merge this now and later fix any arising issues, if any. After all, there is a LOT of new content for AppKit, WalletKit, and TON Connect written in https://github.com/the-ton-tech/ton-docs-private, which we'll need to eventually port over here.