⚡️ Mark all arbitraries as side-effect free (#5771)

**Description**

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Fixes #5560

So far we did it via a post build script as we strip comments in the
build process configured with tsc.

Results: [here](https://stackblitz.com/edit/node-m2wqwvcg).

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.changeset/plenty-snakes-clean.md

@@ -0,0 +1,5 @@
+---
+"fast-check": minor
+---
+
+⚡️ Mark all arbitraries as side-effect free

packages/fast-check/postbuild/main.mjs

@@ -87,6 +87,15 @@ fs.readFile(path.join(__dirname, '../package.json'), (err, data) => {
   if (docReplacement.length === 1 && docReplacement[0].hasChanged) {
     console.info(`Package details added onto doc`);
   }
+
+  const noSideEffectsOnAllArbitraries = replaceInFileSync({
+    files: ['lib/arbitrary/*.js', 'lib/cjs/arbitrary/*.js'],
+    from: [(file) => `function ${path.basename(file).split('.')[0]}(`],
+    to: [(match) => `/**@__NO_SIDE_EFFECTS__*/${match}`],
+  });
+  if (noSideEffectsOnAllArbitraries.length === 1 && noSideEffectsOnAllArbitraries[0].hasChanged) {
+    console.info(`No side effects tags added onto arbitraries`);
+  }
 });
 
 // Helpers