chore: use snake case for API body request fields

[vansangpfiev]

Describe Your Changes

This pull request includes changes to standardize the naming convention for JSON fields in the codebase and documentation. The changes primarily involve replacing camelCase field names with snake_case equivalents.

Standardization of JSON field names:

• docs/docs/basic-usage/index.mdx: Updated JSON field name from taskId to task_id in the DELETE request example.
• docs/docs/capabilities/models/sources/index.mdx: Updated JSON field names from modelPath to model_path and taskId to task_id in the POST and DELETE request examples. [1] [2]
• docs/static/openapi/cortex.json: Updated multiple JSON field names from camelCase to snake_case, including taskId to task_id and modelPath to model_path, in the OpenAPI specification. [1] [2] [3] [4] [5] [6] [7]
• engine/cli/commands/model_import_cmd.cc and engine/cli/commands/model_pull_cmd.cc: Updated JSON field names from modelPath to model_path and taskId to task_id in the respective command implementations. [1] [2]
• engine/common/download_task_queue.h: Updated method parameters and internal field names from taskId to task_id. [1] [2]
• engine/controllers/models.cc: Updated JSON field names and related variables from camelCase to snake_case, including taskId to task_id and modelPath to model_path. [1] [2] [3] [4] [5]
• engine/e2e-test/test_api_model_import.py: Updated JSON field names from modelPath to model_path in the test cases. [1] [2]

Fixes Issues

• Closes #
• Closes #

Self Checklist

• Added relevant comments, esp in complex areas
• Updated docs (for bug fixes / features)
• Created issues for follow-up changes or refactoring needed

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