feat(bench): add BenchContext::start() and BenchContext::end() (#18734)

Closes #17589.
```ts
Deno.bench("foo", async (t) => {
  const resource = setup(); // not included in measurement
  t.start();
  measuredOperation(resource);
  t.end();
  resource.close(); // not included in measurement
});
```

2 files changed, 7 insertions, 1 deletions

diff --git a/cli/tests/integration/bench_tests.rs b/cli/tests/integration/bench_tests.rs
index 0ba297e63..73d541aa6 100644
--- a/cli/tests/integration/bench_tests.rs
+++ b/cli/tests/integration/bench_tests.rs
@@ -181,6 +181,12 @@ itest!(check_local_by_default2 {
   exit_code: 1,
 });
 
+itest!(bench_explicit_start_end {
+  args: "bench --quiet -A bench/explicit_start_and_end.ts",
+  output: "bench/explicit_start_and_end.out",
+  exit_code: 1,
+});
+
 itest!(bench_with_config {
   args: "bench --config bench/collect/deno.jsonc bench/collect",
   exit_code: 0,
diff --git a/cli/tests/integration/lsp_tests.rs b/cli/tests/integration/lsp_tests.rs
index 15ede69ea..22951825b 100644
--- a/cli/tests/integration/lsp_tests.rs
+++ b/cli/tests/integration/lsp_tests.rs
@@ -5130,7 +5130,7 @@ fn lsp_completions_auto_import() {
         "source": "./b.ts",
         "data": {
           "exportName": "foo",
-          "exportMapKey": "foo|6802|file:///a/b",
+          "exportMapKey": "foo|6811|file:///a/b",
           "moduleSpecifier": "./b.ts",
           "fileName": "file:///a/b.ts"
         },