[Android] Optimize MauiWindowInsetListener registry with ConditionalWeakTable

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Note

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It would be very helpful if you could test the resulting artifacts from this PR and let us know in a comment if this change resolves your issue. Thank you!

Description of Change

Addresses performance concern from #32278 (comment).

The FindListenerForView method had O(n*m) complexity due to nested iteration:

• Outer loop: walk view hierarchy (n levels, typically 10-20+)
• Inner loop: linear search through registered views (m entries)
• Runs on every layout operation

Changes:

• Replace List<ViewEntry> with ConditionalWeakTable<AView, MauiWindowInsetListener>
• Remove ViewEntry record and manual weak reference management
• Simplify RegisterView, UnregisterView, and FindListenerForView to use dictionary operations

Performance impact:

• Complexity: O(n*m) → O(n)
• Dictionary lookup is O(1) vs linear search O(m)
• Automatic GC-based cleanup vs manual cleanup during lookups
• Thread-safe by default

Code change:

// Before: nested loops with manual cleanup
for (int i = _registeredViews.Count - 1; i >= 0; i--)
{
    var entry = _registeredViews[i];
    if (!entry.View.TryGetTarget(out var registeredView))
        _registeredViews.RemoveAt(i);
    else if (ReferenceEquals(registeredView, parentView))
        return entry.Listener;
}

// After: direct lookup
if (_registeredViews.TryGetValue(parentView, out var listener))
    return listener;

Net: -36 lines, eliminates hot path overhead in deep view hierarchies.

Issues Fixed

Implements optimization suggested in #32278 (comment 3504288138)

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Original prompt

Can you create a PR based on the comments made here #32278 (comment)

Thoroughly analyze these comments and everywhere you agree with them please apply changes in a new PR

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