feat: introduce user datasets

[CuriousDolphin]

Add User Cloud Dataset support

CONTEXT

The PR introduces cloud dataset management capabilities to the Focoos SDK, allowing users to create, upload, download, and manage datasets in the cloud. This enhancement enables better data organization and sharing capabilities for training models.

KEY CHANGES

• Add new RemoteDataset class for managing cloud datasets
  • get_info
  • delete
  • delete-data
  • upload-data
  • download-data
• Add dataset management methods to Focoos class:
  • list_datasets()
  • add_remote_dataset()
  • get_remote_dataset()
• Refactor HTTP client into dedicated ApiClient class with improved file upload/download capabilities
• Add dataset preview and spec models to support dataset metadata

IMPACT

• Affects all SDK components that interact with remote datasets
• Changes how HTTP requests are handled throughout the codebase
• Introduces new dataset management workflows for users

[github-actions]

Coverage Report •

File	Stmts	Miss	Cover	Missing
__init__.py	11	0	100%
focoos.py	135	21	84%	302–303, 345–356, 374, 377–381, 393
ports.py	244	0	100%
remote_dataset.py	66	4	93%	71–72, 102, 116
remote_model.py	139	36	74%	230–232, 237, 241–242, 244–245, 249–250, 278–286, 288–291, 295–298, 302–307, 309–310, 367
utils
api_client.py	69	29	57%	40, 42, 141–144, 175, 191–203, 205–207, 209, 219–223
system.py	60	7	88%	11–12, 106–110
TOTAL	1152	195	83%

Tests	Skipped	Failures	Errors	Time
118	0 💤	0 ❌	0 🔥	15.271s ⏱️

[github-actions]

Coverage Report •

File	Stmts	Miss	Cover	Missing
__init__.py	11	0	100%
focoos.py	139	19	86%	362–373, 376, 379–383, 386
ports.py	253	0	100%
remote_dataset.py	57	45	21%	13–15, 18–19, 22–28, 31–32, 34–39, 42–50, 54–59, 61, 67–69, 71–72, 75–78
remote_model.py	139	36	74%	230–232, 237, 241–242, 244–245, 249–250, 278–286, 288–291, 295–298, 302–307, 309–310, 367
utils
api_client.py	43	7	83%	37, 39, 138–141, 161
system.py	57	5	91%	102–106
TOTAL	1127	209	81%

Tests	Skipped	Failures	Errors	Time
109	0 💤	0 ❌	0 🔥	3.219s ⏱️