feat(flags): Implement LaunchDarkly Integrations

[adinauer]

📜 Description

Implement LaunchDarkly Integrations for Android (sentry-launchdarkly-android) and JVM (sentry-launchdarkly-server)

💡 Motivation and Context

Closes #4867

💚 How did you test it?

📝 Checklist

• I added GH Issue ID & Linear ID
• I added tests to verify the changes.
• No new PII added or SDK only sends newly added PII if sendDefaultPII is enabled.
• I updated the docs if needed.
• I updated the wizard if needed.
• Review from the native team if needed.
• No breaking change or entry added to the changelog.
• No breaking change for hybrid SDKs or communicated to hybrid SDKs.

🔮 Next steps

[adinauer]

Android snippet used for testing in our Sample Android App:

    LDConfig config =
      new LDConfig.Builder(LDConfig.Builder.AutoEnvAttributes.Disabled)
        .mobileKey("mobile-key")
        .hooks(Components.hooks()
          .setHooks(Arrays.asList(new SentryLaunchDarklyAndroidHook())))
        .build();
    LDContext context = LDContext.create("context-key-123abc");
    ldClient = LDClient.init(this.getApplication(), config, context, 0);
    ldClient.track("691af61abada7a09f600e4d8");
ldClient.boolVariation("my-ld-flag1", false);

[adinauer]

Server snippet used for testing on our Spring Boot 3 sample:

  @Bean
  public LDClient launchDarkly() {
    LDConfig config =
        new LDConfig.Builder()
          .hooks(Components.hooks()
            .setHooks(Arrays.asList(new SentryLaunchDarklyServerHook())))
            .build();
    LDClient ldClient = new LDClient("sdk-key", config);

    return ldClient;
  }

    boolean flagValue =
      client.boolVariation("my-ld-flag1", LDContext.create("example-context-key"), false);

[github-actions]

	Messages
📖	Do not forget to update Sentry-docs with your feature once the pull request gets approved.

Generated by 🚫 dangerJS against 0874d7a

[adinauer]

Not sure how we would test this e2e on our samples since a LaunchDarkly account is needed to successfully retrieve flag values.

[adinauer]

Maybe we could utilize https://demo.app.launchdarkly.com/projects/default/flags?env=production&selected-env=production but I assume since this is public we can't really rely on it producing any predictable results for testing. Also not sure if / how we can get SDK and mobile keys for it.

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	351.65 ms	426.18 ms	74.54 ms
Size	1.58 MiB	2.13 MiB	557.32 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
604a261	380.65 ms	451.27 ms	70.62 ms
ee747ae	382.73 ms	435.41 ms	52.68 ms
b77456b	393.26 ms	441.10 ms	47.84 ms
9fbb112	401.87 ms	515.87 ms	114.00 ms
806307f	357.85 ms	424.64 ms	66.79 ms
27d7cf8	309.43 ms	364.27 ms	54.85 ms
7314dbe	437.83 ms	505.64 ms	67.81 ms
d217708	375.27 ms	415.68 ms	40.41 ms
96449e8	361.30 ms	423.39 ms	62.09 ms
1df7eb6	397.04 ms	429.64 ms	32.60 ms

App size

Revision	Plain	With Sentry	Diff
604a261	1.58 MiB	2.10 MiB	533.42 KiB
ee747ae	1.58 MiB	2.10 MiB	530.95 KiB
b77456b	1.58 MiB	2.12 MiB	548.11 KiB
9fbb112	1.58 MiB	2.11 MiB	539.18 KiB
806307f	1.58 MiB	2.10 MiB	533.42 KiB
27d7cf8	1.58 MiB	2.12 MiB	549.42 KiB
7314dbe	1.58 MiB	2.10 MiB	533.45 KiB
d217708	1.58 MiB	2.10 MiB	532.97 KiB
96449e8	1.58 MiB	2.11 MiB	539.35 KiB
1df7eb6	1.58 MiB	2.10 MiB	532.97 KiB

Previous results on branch: feat/launchdarkly

Startup times

Revision	Plain	With Sentry	Diff
43b9a96	294.94 ms	352.54 ms	57.60 ms
06ca16e	297.48 ms	345.96 ms	48.48 ms

App size

Revision	Plain	With Sentry	Diff
43b9a96	1.58 MiB	2.13 MiB	557.31 KiB
06ca16e	1.58 MiB	2.13 MiB	557.31 KiB

[markushi]

Since this is a public method anyway, we could write a test which mimics the afterEvaluation call, and verifies a mocked scope .addFeatureFlag() call is being made. WDYT?