refactor(scripts): improve Ollama performance evaluation

[frgfm]

This PR introduces the following modifications:

• add HTTP evaluation to avoid Ollama stat reporting issues
• renamed script and benchmark result
• improved script output

pxlksr/opencodeinterpreter-ds:6.7b-Q4_K_M (5 runs) at 2024-03-27 18:35:42.451474+00:00
HTTP: ttft 180.28ms (± 54.44) | ingestion 76.27 tok/s (± 9.39) | generation 38.00 tok/s (± 1.43)
Ollama-reported: load duration 0.25ms (± 0.35) | ingestion 77.58 tok/s (± 9.46) | generation 38.33 tok/s (± 1.49)