Add generated config option listing

[keilogic]

Summary

• add slither --list-config to print supported config-file keys and defaults from defaults_flag_in_config
• serialize enum defaults to JSON-friendly values for generated docs/config starters
• allow config-file keys with hyphens, such as json-types, to map onto argparse underscore attributes while preserving CLI precedence
• update docs/src/Usage.md with the generated Slither + crytic-compile config list

Fixes #1155.

Tests

• python -m pytest tests\unit\utils\test_command_line.py -q
• python -m slither --list-config
• python -m ruff check slither\utils\command_line.py slither\__main__.py tests\unit\utils\test_command_line.py
• git diff --check

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