feat(): add customize boto core config for OSS storage provider

[JunchengXue]

No description provided.

[Copilot]

Pull Request Overview

This PR adds support for customizing boto3 core configuration specifically for OSS (Object Storage Service) storage providers. The changes enable proper integration with OSS by handling OSS-specific requirements and endpoint configurations.

• Add optional endpoint and storage provider fields to user credentials
• Implement OSS-specific boto3 configuration with checksum validation settings
• Add endpoint URL configuration support for alternative storage providers

[Copilot]

The endpoint URL assignment logic has a potential issue. If both self.user_credential.endpoint and Env.current.s3_endpoint_url are set, the environment variable will overwrite the user credential endpoint without any indication. Consider either documenting this precedence or adding a warning when both are present.

Suggested change

	if self.user_credential.endpoint is not None:
	log.warning(
	"Both user credential endpoint (%s) and environment S3 endpoint (%s) are set. "
	"Environment S3 endpoint will take precedence.",
	self.user_credential.endpoint,
	Env.current.s3_endpoint_url,
	)
	kwargs["endpoint_url"] = Env.current.s3_endpoint_url

[Copilot]

The hardcoded string "OSS" should be defined as a constant to improve maintainability and prevent typos. Consider defining OSS_STORAGE_PROVIDER = "OSS" at the module level.

Suggested change

	and self.user_credential.storage_provider == "OSS"
	and self.user_credential.storage_provider == OSS_STORAGE_PROVIDER