Feature/dan skeleton - DIFF (DRAFT)

[livingrockrises]

PR-Codex overview

The focus of this PR is to introduce a new DAN module and enhance session-related functionality.

Detailed summary

• Added DAN_BACKEND_URL constant
• Updated session-related interfaces with danModuleInfo
• Added DanModuleInfo type
• Introduce DANSessionKeyManagerModule
• Updated error messages in Constants.ts
• Added DanSignatureObject interface
• Updated build scripts for typescript files

The following files were skipped due to too many changes: src/modules/utils/Helper.ts, tests/playground/write.test.ts, src/account/BiconomySmartAccountV2.ts, src/modules/sessions/sessionSmartAccountClient.ts, src/modules/session-storage/DANSessionStorage.ts, src/modules/sessions/dan.ts, src/modules/DANSessionKeyManagerModule.ts

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