[Jobs Match Making] Build benchmarking framework

[aldbr]

Description

Build a performance test suite using Locust to benchmark the matching system. This framework will be reused for all subsequent phases (Redis, Lua).

The framework should generate submit job scheduling requirements at configurable scale, using the LHCb production distributions to make the data realistic. It should measure throughput (matches/sec) and latency distribution.

Definition of Done

• Locust test file with configurable parameters (number of jobs, sites, arrival rate)
• Realistic distributions based on the production data (will likely be provided by us)
• Baseline benchmark of the Python prototype
• Results documented: throughput and latency at various scales
• README with instructions to run benchmarks