feat: Inline context for custom events

[devin-ai-integration]

Include full context in custom events and update to inline-context-all capability

Description

This PR updates the Flutter Client SDK to include the full context in custom events instead of just context keys. It also updates the contract test capabilities to use inline-context-all instead of inline-context.

Changes

• Updated CustomEventSerialization class to include full context for custom events
• Updated contract test capabilities to use inline-context-all

Testing

• Changes will be verified by CI tests

Link to Devin run

https://app.devin.ai/sessions/6315fa1653c84dcc931a5b3ec6485a64

Requested by

[email protected]

[devin-ai-integration]

Original prompt from [email protected]:

Received message in Slack channel #sdk-tools:

@Devin I need you to make the same type of change across three different repositories -- erlang-server-sdk, flutter-client-sdk, and the cpp-sdks repository.

When we generate custom events (and migration op events if supported), we JSON encode the event to only include the context keys, not the full context. Please update those repositories so that custom and migration events include the full context.

For reference, you can look at the follow commits. This is prior work where we inlined the context for other events in those repositories.

erlang: e5c6cc4da4cd6dc59326bb5fa0b0a75864c72bc7
flutter: b2ebcbfd8c3c817595821f91ffb7ac02687bb41f
cpp: bc77e89d1bf5b2294e2b384363b32734fd1f75db

You can also look at <https://github.com/launchdarkly/ruby-server-sdk/commit/ab5b14fff2f04f1dfa7e6f61669bc348fffb5cac> which shows how we inlined contexts for custom and migration events in ruby.

When doing this work, please make sure to update all the unit tests. Also check for any code that is now unused as a result of the change.

In the contract tests for these repositories, replace the inline-context capability with inline-context-all.

When making the PRs, name as follows:

- erlang :: mk/sdk-1156/inline-contexts
- flutter :: mk/sdk-1165/inline-contexts
- cpp :: mk/sdk-1157/inline-contexts

[devin-ai-integration]

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