feat(experiment): add charm prompts to iostreams

[zimeg]

Summary

This PR adds charm prompts to the iostreams package as an option for prompts when the charm experiment is on! 🍀

For kind discussion of #349 📺 ✨

Reviewers

Attempt a few commands to find various options appear:

$ slack create asdf -e charm  # Automation app > Deno Slack SDK
$ cd asdf
$ slack deploy -e charm
$ slack env add -e charm
$ slack delete -e charm

This shows select options, text inputs, and confirmation!

Requirements

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.

[codecov]

Codecov Report

❌ Patch coverage is 4.76190% with 80 lines in your changes missing coverage. Please review.
✅ Project coverage is 64.44%. Comparing base (62770ba) to head (952c731).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/iostreams/charm.go	0.00%	65 Missing ⚠️
internal/iostreams/survey.go	0.00%	10 Missing ⚠️
internal/pkg/auth/login.go	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #350      +/-   ##
==========================================
- Coverage   64.62%   64.44%   -0.18%     
==========================================
  Files         212      213       +1     
  Lines       17820    17879      +59     
==========================================
+ Hits        11517    11523       +6     
- Misses       5225     5281      +56     
+ Partials     1078     1075       -3     

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[srtaalej]

woah! great idea adding charm to the iostreams package! this make this migration so much easier 😁 testing went well for me - the cli is looking beauuuuuuutiful 🤩

[zimeg]

@srtaalej Credit to claude and perhaps earlier refactors to prompt from iostreams helped so much! 👾 ✨

Thanks so much for the review! I agree this is a fast approach to bringing these prompts to most surfaces, but let's continue to improve how some experiences appear - I find create lags when selecting "samples" for example. And perhaps we explore themes more soon 🎨

Let's get this merged behind the charm experiment for now! 🚢 💨