Expose the client id + hard code for NoOp instance

[eliasyishak]

Fixes:

• Expose the clientId on the Analytics instance #162

---

• I’ve reviewed the contributor guide and applied the relevant portions to this PR.

Contribution guidelines:

• See our contributor guide 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 and use dart format.
• Most changes should add an entry to the changelog and may need to rev the pubspec package version.
• Changes to packages require corresponding tests.

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

[christopherfujino]

is this addition going to break existing clients? if so, we better bump the major version.

[eliasyishak]

Ah good call, seems like the analysis server is implementing our NoOp instance so I will bump the version to 4.0.0

https://github.com/dart-lang/sdk/blob/main/pkg/analysis_server/test/src/analytics/analytics_manager_test.dart#L559-L564

[christopherfujino]

Code lgtm, just a question about if we should bump major version