perf!: allow reducing data retention, by adding retainSamples option on bench and task level, default is false (#421)

* perf: reduce data retention

* Update src/task.ts

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* fix lint

* add retainSamples option

* fix

* fix

* fix

* fix linting etc.

* Update README.md

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: Uzlopak

README.md

@@ -157,6 +157,28 @@ bench.concurrency = 'task' // The concurrency mode to determine how tasks are ru
 await bench.run()
 ```
 
+## Retaining Samples
+
+By default Tinybench does not keep the samples for `latency` and `throughput` to
+minimize memory usage. Enable sample retention if you need the raw samples for
+plotting, custom analysis, or exporting results.
+
+You can enable samples retention at the bench level by setting the
+`retainSamples` option to `true` when creating a `Bench` instance:
+
+```ts
+const bench = new Bench({ retainSamples: true })
+```
+
+You can also enable samples retention by setting the `retainSamples` option to
+`true` when adding a task:
+
+```ts
+bench.add('task with samples', () => {
+  // Task logic here
+}, { retainSamples: true })
+```
+
 ## Aborting Benchmarks
 
 Tinybench supports aborting benchmarks using `AbortSignal` at both the bench and task levels: