MINIFICPP-2854 Add benchmark scripts for repositories

[lordgamez]

https://issues.apache.org/jira/browse/MINIFICPP-2854

Report generation and README was generated using Claude Code.

Depends on #2203

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Pull request overview

Adds tooling to benchmark MiNiFi C++ FlowFile and content repository implementations.

Changes:

• Adds single and batch benchmark runners with multiple workload modes.
• Collects CPU, memory, repository-size, and throughput metrics.
• Generates aggregated HTML reports and documents usage.

File summaries

File	Description
run_benchmark.py	Runs workloads and collects metrics.
run_batch.py	Executes repeated repository combinations.
generate_report.py	Generates aggregate HTML reports.
resources/get_config.json	Defines GetFile benchmark flow.
resources/generate_config.json	Defines GenerateFlowFile benchmark flow.
requirements.txt	Declares Python dependencies.
README.md	Documents benchmark workflows.
results/.gitignore	Excludes generated results.

Review details

Suppressed comments (1)

benchmarks/repository_benchmark/run_benchmark.py:222

• As in the startup waiter, this newly returned docker-py Container has not been reloaded, so attrs["Created"] is not guaranteed to exist and burst runs can fail immediately with KeyError. Start from the beginning of this container's logs instead.

    since = datetime.fromisoformat(container.attrs["Created"])

• Files reviewed: 8/8 changed files
• Comments generated: 6
• Review effort level: Balanced

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