feat: implement DID registration with JWT signing

- Add full DID registration flow matching TypeScript version
- Implement ES256K JWT signing with PEM key format
- Add async/await support for JWT operations
- Improve error handling and debug output
- Add rich documentation and type hints

Technical Changes:
- Convert private key to PEM format for JWT signing
- Match TypeScript's JWT payload structure
- Add proper JWT header with ES256K algorithm
- Implement async functions for JWT creation
- Add detailed debug output for JWT parts

Documentation:
- Add module-level docstring with flow description
- Add function-level docstrings with examples
- Document security considerations
- Add technical details and error handling info

Dependencies:
- Add cryptography for key format conversion
- Add jwcrypto for JWT operations
- Update requirements.txt with versions and comments

This commit implements the complete DID registration flow,
matching the TypeScript implementation's behavior and
adding comprehensive documentation and error handling.

test-scripts/package.json

@@ -0,0 +1,23 @@
+{
+  "name": "did-registration",
+  "version": "1.0.0",
+  "description": "DID creation and registration flow",
+  "main": "new_flow.js",
+  "scripts": {
+    "start": "ts-node new_flow.ts",
+    "build": "tsc"
+  },
+  "author": "Matthew Raymer",
+  "license": "MIT",
+  "dependencies": {
+    "@ethersproject/hdnode": "^5.7.0",
+    "@ethersproject/wallet": "^5.7.0",
+    "axios": "^1.6.2",
+    "did-jwt": "^6.11.6"
+  },
+  "devDependencies": {
+    "@types/node": "^20.10.0",
+    "ts-node": "^10.9.1",
+    "typescript": "^5.3.2"
+  }
+}