Important

Add /internal/functions/{function_name}/throughput-by-variant endpoint to fetch function throughput data grouped by variant and time period, with tests and datetime serialization support.

• Behavior:
  • Adds /internal/functions/{function_name}/throughput-by-variant endpoint in internal.rs to return inference counts grouped by variant and time period.
  • Supports time windows: minute, hour, day, week, month, cumulative.
• Models:
  • Adds GetFunctionThroughputByVariantParams and VariantThroughput to inference_stats.rs.
  • Adds GetFunctionThroughputByVariantResponse and VariantThroughput types in GetFunctionThroughputByVariantResponse.ts and VariantThroughput.ts.
• Functions:
  • Implements get_function_throughput_by_variant in inference_stats.rs.
  • Adds serialize_utc_datetime_rfc_3339_with_millis to serde_util.rs for datetime serialization.
• Tests:
  • Adds tests for the new endpoint in inference_stats_queries.rs and inference_stats.rs.
  • Adds E2E tests in inference_stats.rs for various time windows and edge cases.
• Misc:
  • Updates Cargo.toml and Cargo.lock to include regex dependency.

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