Refactor benchmark-queries command and add new features

[tanmay-9]

In particular:

• When the queries are input via a .yml file, take the query names and descriptions from there
• Add benchmark_name and benchmark_description to the result .yml file. These are taken from the input .yml file if it exists, and can be overridden by the command-line arguments --benchmark-name and --benchmark-description; the default is the value of NAME with first letter capitalized
• Add option --restart-on-hang option to automatically restart the server when it does not respond within TIMEOUT plus 30s
• So far, the pretty-printing of the queries always used docker, now uses what's in SYSTEM (defaults to docker if SYSTEM = native)

NOTE: This is not backwards-compatible with the previous format of the .yml result file