feat: discovered hosts returned as dict

[adamkirchberger]

Update to the Nectl client interface to return a dict of hosts rather than a list which is more efficient for clients to work with.

[netlify]

✅ Deploy Preview for nectl ready!

Name	Link
🔨 Latest commit	a2fb497
🔍 Latest deploy log	https://app.netlify.com/sites/nectl/deploys/653f8f6c9a961c00071e3123
😎 Deploy Preview	https://deploy-preview-25--nectl.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[codecov]

Codecov Report

Merging #25 (a2fb497) into main (1107ac4) will increase coverage by 1.89%.
Report is 3 commits behind head on main.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #25      +/-   ##
==========================================
+ Coverage   92.32%   94.21%   +1.89%     
==========================================
  Files          20       20              
  Lines         951      951              
==========================================
+ Hits          878      896      +18     
+ Misses         73       55      -18     

Files	Coverage Δ
nectl/configs/cli.py	85.71% <100.00%> (+19.78%)	⬆️
nectl/datatree/cli.py	87.23% <100.00%> (ø)
nectl/datatree/hosts.py	100.00% <100.00%> (ø)
nectl/nectl.py	100.00% <100.00%> (ø)