[RUM 9145] Refactor RUM Action Tracking

[cdn34dd]

What does this PR do?

Introduces a new method for automatic RUM action tracking using a Babel plugin. This plugin scans the user’s codebase for specific actions and wraps them with our custom logic.

This serves as a direct replacement for our current approach, which relies on wrapping React internals. That legacy method is no longer compatible with the latest versions of Expo.

The new system supports a dual-mode setup: if the Babel plugin is not included, the existing approach remains active. However, once the plugin is added, it takes full precedence and the legacy method is disabled. This setup allows users to adopt the new system gradually and gives us the opportunity to evaluate it performs before deprecating the original implementation.

Motivation

Provide a reliable and consistent way to automatically track RUM actions across all types of React Native applications—whether built with Expo or React Native CLI. The goal is to ensure compatibility across all versions of React Native and maintain consistent behavior regardless of whether the app uses the New Architecture or the Old Architecture.

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests
• Make sure you discussed the feature or bugfix with the maintaining team in an Issue
• Make sure each commit and the PR mention the Issue number (cf the CONTRIBUTING doc)
• If this PR is auto-generated, please make sure also to manually update the code related to the change

[marco-saia-datadog]

Top-notch work! 👏

I would wait for the final round of testing before merging. As an alternative we could set "private": true in package.json until we're confident rolling it out.

WDYT?

[marco-saia-datadog]

I forgot to mention it before, but we should add a README.md with a description of the new package and setup instructions.

[buraizu]

Requesting some minor edits. In addition to these, could you please add the following line at the end of the doc, after the last code example (with a blank line between the code example and the link)?

[1]: https://www.npmjs.com/package/@datadog/mobile-react-native

This makes translation of the doc easier, as mentioned in our style guide

[marco-saia-datadog]

IMPORTANT

Testing on iOS old architecture (RN 0.65) I have encountered a critical runtime error because of sendTelemetryLog being undefined.

The reason is the missing RCT macro on DdSdk.mm.

You should add this:

RCT_REMAP_METHOD(sendTelemetryLog, withMessage:(NSString*)message
                 withAttributes: (NSDictionary *)attributes
                 withConfig:(NSDictionary *)config
                 withResolver:(RCTPromiseResolveBlock)resolve
                 withRejecter:(RCTPromiseRejectBlock)reject)
{
    [self sendTelemetryLog:message attributes:attributes config:config resolve:resolve reject:reject];
}