refactor: change some internal fields to ten_value_t and implement loop_all_fields functions

[sunxilin]

refactor: change some internal fields to ten_value_t & implement loop fields functions

[sunxilin]

This pull request includes several changes primarily focused on refactoring and improving the consistency of the codebase. The changes include renaming functions for clarity, adding new API functions, and updating field names and processing methods in various files.

Function Renaming and Refactoring:

• core/include/ten_runtime/binding/cpp/internal/msg/audio_frame.h: Renamed ten_audio_frame_alloc_data to ten_audio_frame_alloc_buf for consistency.
• core/include/ten_runtime/msg/audio_frame/audio_frame.h: Updated the function name ten_audio_frame_alloc_data to ten_audio_frame_alloc_buf.
• core/include_internal/ten_runtime/msg/audio_frame/audio_frame.h: Changed the field name from data to buf in the ten_audio_frame_t struct.

API Additions:

• core/include/ten_runtime/msg/cmd_result/cmd_result.h: Added new API functions ten_raw_cmd_result_is_final and ten_raw_cmd_result_set_final.
• core/include/ten_utils/value/value_json.h: Introduced ten_value_init_from_json API function.
• core/include_internal/ten_runtime/common/loc.h: Added ten_loc_to_value and ten_loc_create_from_value API functions.

Field and Method Updates:

• core/include_internal/ten_runtime/msg/audio_frame/field/field.h: Renamed TEN_AUDIO_FRAME_FIELD_DATA to TEN_AUDIO_FRAME_FIELD_BUF.
• core/include_internal/ten_runtime/msg/audio_frame/field/field_info.h: Updated field processing methods to include process_field for various fields. [1] [2] [3] [4] [5] [6] [7] [8]

Miscellaneous Changes:

• .vscode/launch.json: Modified the --gtest_filter argument to exclude ExtensionTest.*AttemptToSuspend*.
• core/include_internal/ten_runtime/common/constant_str.h: Added new string constants TEN_STR_IS_FINAL and TEN_STR_BUF. [1] [2]

These changes aim to improve code readability, maintainability, and consistency across the codebase.