[UA] Add ability to split out sub-events in the `LogStatsFile` (#2059)

Widen protobuf dependency to allow 4.0.0 (#2054)

The generated code here is compatible with the new protobuf version.

[html] Allow ampersands in attribute values. (#2036)

[package_config] Prepare for 2.2.0 release (#2031)

[pub_semver] Remove dependency on `package:meta` (#2021)

[pub_semver] Remove dependency on `package:meta` (#2021)

Merge glob package (#1974)

Merge `package:markdown` (#1208)

- [x] Move and fix workflow files, labeler.yaml, and badges in the
README.md
- [x] Rev the version of the package, so that pub.dev points to the
correct site
- [x] Add a line to the changelog:
```
* Move to `dart-lang/tools` monorepo.
```

- [x] Add the package to the top-level readme of the monorepo:
```
| [markdown](pkgs/markdown/) | A portable Markdown library written in Dart that can parse Markdown into HTML. | [![pub package](https://img.shields.io/pub/v/markdown.svg)](https://pub.dev/packages/markdown) |
```

- [ ] **Important!** Merge the PR with 'Create a merge commit' (enabling
then disabling the `Allow merge commits` admin setting)
- [x] Update the auto-publishing settings on
https://pub.dev/packages/markdown/admin
- [x] Add the following text to https://github.com/dart-lang/markdown/:'

```
> [!IMPORTANT]  
> This repo has moved to https://github.com/dart-lang/tools/tree/main/pkgs/markdown
```

- [ ] Publish using the autopublish workflow
- [ ] Push tags to GitHub using
```git tag --list 'markdown*' | xargs git push origin```

- [x] Close open PRs in dart-lang/markdown with the following message:

```
Closing as the
[dart-lang/markdown](https://github.com/dart-lang/markdown) repository
is merged into the [dart-lang/tools](https://github.com/dart-lang/tools)
monorepo. Please re-open this PR there!
```
      
- [x] Transfer issues by running
```dart run pkgs/repo_manage/bin/report.dart transfer-issues
--source-repo dart-lang/markdown --target-repo dart-lang/tools
--add-label package:markdown --apply-changes```

- [ ] Archive https://github.com/dart-lang/markdown/


---

- [x] I’ve reviewed the contributor guide and applied the relevant
portions to this PR.

<details>
  <summary>Contribution guidelines:</summary><br>

- See our [contributor
guide](https://github.com/dart-lang/.github/blob/main/CONTRIBUTING.md)
for general expectations for PRs.
- Larger or significant changes should be discussed in an issue before
creating a PR.
- Contributions to our repos should follow the [Dart style
guide](https://dart.dev/guides/language/effective-dart) and use `dart
format`.
- Most changes should add an entry to the changelog and may need to [rev
the pubspec package
version](https://github.com/dart-lang/sdk/blob/main/docs/External-Package-Maintenance.md#making-a-change).
- Changes to packages require [corresponding
tests](https://github.com/dart-lang/.github/blob/main/CONTRIBUTING.md#Testing).

Note that many Dart repos have a weekly cadence for reviewing PRs -
please allow for some latency before initial review feedback.
</details>

Merge pull request #1957 from dart-lang/stream-channel-mixin

make StreamChannelMixin an abstract mixin class

pubspec_parse: Added support for `executables` field in `pubspec.yaml` (

#1952)

Co-authored-by: Kevin Moore <kevmoo@users.noreply.github.com>