Add management client for project operations

[HQidea]

Motivation

The library needs to support project management operations within organizations through the Mem0 API.
Users require the ability to create, retrieve, update, and delete projects programmatically.

Modifications

• Add ManagementClient class for synchronous project management operations in memorylake/mem0/extend/management.py.
• Add AsyncManagementClient class for asynchronous project management operations with async context manager support.
• Implement CRUD operations: create_project, get_project, list_projects, update_project, and delete_project in both clients.
• Support custom httpx client injection for both sync and async clients to allow connection pooling and custom configurations.
• Export ManagementClient and AsyncManagementClient from memorylake.mem0 module for easy access.
• Bump version from 0.1.1 to 0.1.2 to reflect the new feature addition.

[codecov]

Codecov Report

❌ Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
memorylake/mem0/__init__.py	0.00%	2 Missing ⚠️

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