Add setPublishableKey

[ShiCheng-Lu]

for ephemeral user keys

tested with example app, can set publishable key to different value (UNAUTHORIZED) then back (successful track)

[Copilot]

Pull request overview

This PR adds a setPublishableKey method to allow updating the publishable key without re-initializing the SDK, primarily intended for use with ephemeral API keys. The method provides a way to dynamically change the API key at runtime.

• Adds a new public method setPublishableKey to the Radar SDK interface
• Includes documentation explaining its purpose for ephemeral API keys

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
RadarSDK/Include/Radar.h	Declares the new setPublishableKey method with proper parameter annotations and documentation
RadarSDK/Radar.m	Implements the new method by delegating to RadarSettings

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[Copilot]

This method has a void return type, so it should not have a return statement. The return statement should be removed to match the pattern used by other setter methods in this file like setUserId and setDescription.

Suggested change

	return [RadarSettings setPublishableKey:key];
	[RadarSettings setPublishableKey:key];