fix: remove file storage

[joepegler]

chore: lint

---

PR-Codex overview

The focus of this PR is to update the package version, move SessionFileStorage to a separate package, and make adjustments to storage types and test cases.

Detailed summary

• Updated package version to 4.4.6
• Moved SessionFileStorage to a separate package
• Adjusted storage types in Types.ts
• Updated test cases for account and sessions
• Refactored session storage logic to use SessionMemoryStorage as a fallback

✨ Ask PR-Codex anything about this PR by commenting with /codex {your question}

[github-actions]

size-limit report 📦

Path	Size
core (esm)	54.11 KB (-0.82% 🔽)
core (cjs)	59.2 KB (-0.96% 🔽)
account (tree-shaking)	51.81 KB (-0.99% 🔽)
bundler (tree-shaking)	2.63 KB (0%)
paymaster (tree-shaking)	2.33 KB (0%)
modules (tree-shaking)	40.23 KB (-0.84% 🔽)