Treat hyperfine parameterized benchmarks as separate benchmarks

[epompeii]

Currently, hyperfine parameterized benchmarks are all given the same benchmark name.

Parameterized benchmarks should include the parameter name and value in their Bencher benchmark name. They may also be set as tags, once that is implemented: #240

[epompeii]

Correction, parameterized benchmarks are all given the same name when the --command-name option is used:

-n, --command-name
Give a meaningful
name to a command.
This can be specified
multiple times if
several commands are
benchmarked.

See this comment for an example: #471 (comment)

The parameters are available in the JSON output:

"parameters": {
  "time": "0"
}

[epompeii]

Also, the --parameter-list option only outputs a single result, not multiple as I would have expected.