Add subfolder listing, workflow templates retrieval, and download directory configuration

[berggren]

Technical Details:

• FilesAPI.download_file Modification: The download_file method now accepts an optional output_dir argument, which defines where the downloaded file will be saved. If output_dir is not provided, a temporary directory is used.
• FoldersAPI.list_subfolders Addition: Added list_subfolders method to retrieve a list of subfolders within a specified folder, returning a list of dictionaries containing metadata for each subfolder.
• WorkflowsAPI.get_workflow_templates Addition: Introduced get_workflow_templates method to retrieve a list of available workflow templates. This method returns a dictionary containing the workflow templates.
• Tests Added/Modified: New tests were added for the list_subfolders and get_workflow_templates methods. The download_file tests were modified to assert that the output_dir parameter is correctly passed to the temporary file creation function.

[codecov]

Codecov Report

❌ Patch coverage is 96.66667% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
openrelik_api_client/workflows.py	83.33%	0 Missing and 1 partial ⚠️

Files with missing lines	Coverage Δ
openrelik_api_client/files.py	86.36% <100.00%> (ø)
openrelik_api_client/folders.py	100.00% <100.00%> (ø)
tests/files_api_test.py	100.00% <ø> (ø)
tests/folders_api_test.py	100.00% <100.00%> (ø)
tests/workflows_api_test.py	100.00% <100.00%> (ø)
openrelik_api_client/workflows.py	38.46% <83.33%> (+4.56%)	⬆️

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[hacktobeer]

LGTM