misc: enable all cargo features in editors (#1387)

## 📔 Objective

Ensure that all features are enabled in Helix and the other editor.

## ⏰ Reminders before review

- Contributor guidelines followed
- All formatters and local linters executed and passed
- Written new unit and / or integration tests where applicable
- Protected functional changes with optionality (feature flags)
- Used internationalization (i18n) for all UI strings
- CI builds passed
- Communicated to DevOps any deployment requirements
- Updated any necessary documentation (Confluence, contributing docs) or
informed the documentation
  team

## 🦮 Reviewer guidelines

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- 👍 (`:+1:`) or similar for great changes
- 📝 (`:memo:`) or ℹ️ (`:information_source:`) for notes or general info
- ❓ (`:question:`) for questions
- 🤔 (`:thinking:`) or 💭 (`:thought_balloon:`) for more open inquiry
that's not quite a confirmed
  issue and could potentially benefit from discussion
- 🎨 (`:art:`) for suggestions / improvements
- ❌ (`:x:`) or ⚠️ (`:warning:`) for more significant problems or
concerns needing attention
- 🌱 (`:seedling:`) or ♻️ (`:recycle:`) for future improvements or
indications of technical debt
- ⛏ (`:pick:`) for minor or nitpick changes

Author: tangowithfoxtrot

.helix/languages.toml

@@ -0,0 +1,4 @@
+[language-server.rust-analyzer.config]
+checkOnSave = { command = "clippy" }
+cargo = { allFeatures = true }
+rustfmt = { extraArgs = [ "+nightly" ] }

.vscode/settings.json

@@ -26,5 +26,8 @@
     "Zeroizing",
     "zxcvbn"
   ],
-  "rust-analyzer.cargo.targetDir": true
+  "rust-analyzer.cargo.targetDir": true,
+  "rust-analyzer.cargo.features": [
+    "all"
+  ]
 }