fix(audience): isolate Install() collector failures

[nattb8]

Fixes SDK-682

What

CollectGameLaunchProperties() and CollectContext() ran back to back with no error handling in AudienceUnityHooks.Install(). An exception in either (most likely a Screen.currentResolution read too early in boot) aborted Install() before the other collector's provider was assigned, silently disabling it too. Each collector now runs in its own try/catch, with the failure logged via Log.Warn and its provider still assigned using whatever partial data survives.

Why

Field data showed real integrators hitting exactly this: one early-boot exception silently stripped context (locale/screen/timezone/userAgent) and game_launch device fields from every event for practically the whole session, with no crash or visible error to flag it.

Test plan

• Reproduced the original bug in the Unity Editor: forced CollectContext() to throw, confirmed the uncaught exception silently blanked context and game_launch properties for the rest of the session (verified via raw event payloads)
• Applied the fix and re-tested with only the screen read forced to throw: confirmed a logged warning instead of an uncaught exception, and that locale/timezone/userAgent still came through with only screen missing
• Confirmed game_launch's own properties (version, cpu, gpu, unity_version, etc.) were unaffected by the context-collector failure, verifying the two collectors are isolated from each other
• Run the existing Audience unit test suite (blocked locally by a pre-existing, unrelated missing-assembly issue in the generated csproj outside Unity; needs Unity Editor Test Runner or CI)

[github-actions]

Audience SDK — Build Size

Platform	SDK Size	Change
Android	0.37 / 20.00 MB	+0.00 MB	✅
Windows	0.16 / 20.00 MB	+0.00 MB	✅
iOS	8.54 / 20.00 MB	+0.03 MB	✅
macOS	0.92 / 20.00 MB	+0.02 MB	✅

SDK Size = build minus empty app. Change = vs baseline. Fails if any platform exceeds its absolute size limit.