feat: cocoapods support for session replay (#153)

<!-- CURSOR_SUMMARY -->
> [!NOTE]
> **Low Risk**
> Low risk: changes only CocoaPods dependency declarations and does not
modify runtime code; potential impact is limited to pod resolution/build
configuration for consumers.
> 
> **Overview**
> Removes the explicit CocoaPods dependency on
`LaunchDarklyObservability/Common` from the `LaunchDarklySessionReplay`
subspec, leaving `LaunchDarklyObservability` as the sole observability
dependency.
> 
> This simplifies pod resolution for Session Replay consumers and relies
on `LaunchDarklyObservability` to bring in any required shared
components transitively.
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
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<!-- /CURSOR_SUMMARY -->

Author: mario-launchdarkly

LaunchDarklySessionReplay.podspec

@@ -35,7 +35,6 @@ Pod::Spec.new do |s|
       'OTHER_SWIFT_FLAGS'                   => '$(inherited) -package-name LaunchDarklyObservability'
     }
     ss.dependency "LaunchDarklySessionReplay/SessionReplayC"
-    ss.dependency "LaunchDarklyObservability/Common"
     ss.dependency "LaunchDarklyObservability"
   end