Add --base <run_id> to compare local run with another run

[GuillaumeLagrange]

$ codspeed exec -m walltime --max-rounds 5 -- sh -c "sleep 0.5 && ls -al > /dev/null"

 Running the benchmarks

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     Walltime - Running `sh -c sleep 0.5 && ls -al > /dev/null` with exec-harness
    ╭─────────────────────────────────────────────────────────────────────────────────────────────────────────────────╮
    │ Executing: sh -c sleep 0.5 && ls -al > /dev/null                                                                │
    │ Completed 2 warmup rounds                                                                                       │
    │ Warmup done, now performing 5 rounds                                                                            │
    ╰─────────────────────────────────────────────────────────────────────────────────────────────────────────────────╯

 Uploading results

  Performance data uploaded
  Linked repository: GuillaumeLagrange/local-runs
    Uploading results 4.3s

 Benchmark results

  sh -c sleep 0.5 && ls -al > /dev/null: best 508.05 ms (5 iterations, rel. stddev: 0.14%, total 2.54 s)

  View full report: http://localhost:3000/GuillaumeLagrange/local-runs/runs/69c28bfa6e3ac6b1b416512f

  To compare future runs against this one, use: --base 69c28bfa6e3ac6b1b416512f

$ codspeed exec -m walltime --max-rounds 5 --base 69c28bfa6e3ac6b1b416512f -- sh -c "sleep 0.5 && ls -al > /dev/null"

 Running the benchmarks

     Walltime - Running `sh -c sleep 0.5 && ls -al > /dev/null` with exec-harness
    ╭─────────────────────────────────────────────────────────────────────────────────────────────────────────────────╮
    │ Executing: sh -c sleep 0.5 && ls -al > /dev/null                                                                │
    │ Completed 2 warmup rounds                                                                                       │
    │ Warmup done, now performing 5 rounds                                                                            │
    ╰─────────────────────────────────────────────────────────────────────────────────────────────────────────────────╯

 Uploading results

  Performance data uploaded
  Linked repository: GuillaumeLagrange/local-runs
    Uploading results 1.4s

 Benchmark results

  ● Impact: 0.1%
  ╭────────────────────────────────────────────────────────────────────────────────────╮
  │                                      Walltime                                     │
  ├───────────────────────────────────────┬───────────┬───────────┬────────┬───────────┤
  │ Benchmark                             │      Base │      Head │ Change │    Status │
  ├───────────────────────────────────────┼───────────┼───────────┼────────┼───────────┤
  │ sh -c sleep 0.5 && ls -al > /dev/null │ 508.05 ms │ 507.53 ms │   0.1% │ No Change │
  ╰───────────────────────────────────────┴───────────┴───────────┴────────┴───────────╯

  View comparison report: http://localhost:3000/GuillaumeLagrange/local-runs/runs/compare/69c28bfa6e3ac6b1b416512f..69c28c5e6e3ac6b1b4165130

  To compare future runs against this one, use: --base 69c28c5e6e3ac6b1b4165130

[codspeed-hq]

Merging this PR will not alter performance

✅ 4 untouched benchmarks

---

_{Comparing cod-1796-make-comparison-between-two-local-runs-easier (aaad11b) with main (f9cdf47)}