Add an option to generate yaml file with results for performance comparison in example queries

[tanmay-9]

• Takes --queries-file argument with a yaml filename as input to read the queries (format of yaml file: {queries: [{query: str, sparql: str}]}
• Takes --generate-output-file argument to specify whether to generate a yaml file which can be used for performance comparison web app.
• Takes --output-basename and --backend-name arguments, so that the output file can be named {args.output_basename}.{args.backend_name}.results.yaml
• Added support for qlever-results+json header to example-queries
• When output file needs to be generated, automatically use tsv format to get results for non-qlever backends and qlever-results+json format for qlever backends to get runtime execution tree information.
• Added ruamel.yaml as a dependency in pyproject.toml to work with yaml files.