feat: add Stacks app

[obycode]

This app tracks the latest block (height and time) for the Stacks network as well as the current price of STX in Sats and USD.

[tidbyt]

⚠️ The automated review process is experimental and likely has bugs. Please bear with us as we iron out the kinks and enable you to ship changes at high velocity 🚀

Next Steps

Hello! Thank you so much for your change 🤜 🤛 . There are a few things you need to do:

• Sign the CLA if you haven't already
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Manual Review Required

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	Test	Details
✅	App Dir	All files are in a single app directory
🟡	Modules	Usage of http.star requires review
✅	Original Author	The original author matches the PR author

[tidbyt-bot]

CLA Assistant Lite bot All contributors have signed the CLA ✍️ ✅

[obycode]

I have read the CLA Document and I hereby sign the CLA

[obycode]

recheck

[obycode]

Sorry for the commits after opening the PR. I saw some quick improvements to the look after I saw it here! Thanks in advance for your review! This will be my first Tydbit app.