feat(cli/tools): add TAP test reporter (#14390) (#20073)

This PR adds a test reporter for the [Test Anything
Protocol](https://testanything.org).

It makes the following implementation decisions:
- No TODO pragma, as there is no such marker in `Deno.test`
- SKIP pragma for `ignore`d tests
- Test steps are treated as TAP14 subtests
  - Support for this in consumers seems spotty
- Some consumers will incorrectly interpret these markers, resulting in
unexpected output
- Considering the lack of support, and to avoid implementation
complexity,
subtests are at most one level deep (all test steps are in the same
subtest)
- To accommodate consumers that use comments to indicate test-suites
(unspecced)
  - The test module path is output as a comment
  - This is disabled for `--parallel` testing
- Failure diagnostics are output as JSON, which is also valid YAML
- The structure is not specified, so the format roughly follows the spec
example:
  ```
  ---
  message: "Failed with error 'hostname peebles.example.com not found'"
  severity: fail
  found:
    hostname: 'peebles.example.com'
    address: ~
  wanted:
    hostname: 'peebles.example.com'
    address: '85.193.201.85'
  at:
    file: test/dns-resolve.c
    line: 142
  ...
  ```
  

1 files changed, 19 insertions, 2 deletions

diff --git a/cli/args/flags.rs b/cli/args/flags.rs
index 544123887..773c95fec 100644
--- a/cli/args/flags.rs
+++ b/cli/args/flags.rs
@@ -225,6 +225,7 @@ pub enum TestReporterConfig {
   Pretty,
   Dot,
   Junit,
+  Tap,
 }
 
 #[derive(Clone, Debug, Default, Eq, PartialEq)]
@@ -1980,7 +1981,7 @@ Directory arguments are expanded to all contained files matching the glob
       Arg::new("reporter")
         .long("reporter")
         .help("Select reporter to use. Default to 'pretty'.")
-        .value_parser(["pretty", "dot", "junit"])
+        .value_parser(["pretty", "dot", "junit", "tap"])
     )
   )
 }
@@ -3369,13 +3370,14 @@ fn test_parse(flags: &mut Flags, matches: &mut ArgMatches) {
         "pretty" => TestReporterConfig::Pretty,
         "junit" => TestReporterConfig::Junit,
         "dot" => TestReporterConfig::Dot,
+        "tap" => TestReporterConfig::Tap,
         _ => unreachable!(),
       }
     } else {
       TestReporterConfig::Pretty
     };
 
-  if matches!(reporter, TestReporterConfig::Dot) {
+  if matches!(reporter, TestReporterConfig::Dot | TestReporterConfig::Tap) {
     flags.log_level = Some(Level::Error);
   }
 
@@ -6839,6 +6841,21 @@ mod tests {
       }
     );
 
+    let r = flags_from_vec(svec!["deno", "test", "--reporter=tap"]);
+    assert_eq!(
+      r.unwrap(),
+      Flags {
+        subcommand: DenoSubcommand::Test(TestFlags {
+          reporter: TestReporterConfig::Tap,
+          ..Default::default()
+        }),
+        no_prompt: true,
+        type_check_mode: TypeCheckMode::Local,
+        log_level: Some(Level::Error),
+        ..Flags::default()
+      }
+    );
+
     let r = flags_from_vec(svec![
       "deno",
       "test",