Add namespace replacement rule for com.google.mlkit packages

[Copilot]

MLKit packages were generating inconsistent namespaces. The genai-prompt and genai-common packages used Google.MLKit.GenAI.* while existing MLKit packages used Xamarin.Google.MLKit.*.

Changes

Added namespace replacement rule in Directory.Build.props:

<AndroidNamespaceReplacement Include='com.google.mlkit' Replacement='Xamarin.Google.MLKit' />

Positioned before the general com.google. → Google rule to ensure MLKit packages match the established pattern.

Impact

• 36 MLKit packages now use consistent Xamarin.Google.MLKit.* namespace prefix
• Fixes genai-prompt: com.google.mlkit.genai.prompt → Xamarin.Google.MLKit.GenAI.Prompt
• Fixes genai-common: com.google.mlkit.genai.common → Xamarin.Google.MLKit.GenAI.Common
• Fixes digital-ink packages to match convention

Note on GoogleGson

The com.google.code.gson package uses GoogleGson namespace without the Xamarin prefix. This is the only Google package (out of 258) with this inconsistency, but was left unchanged to avoid breaking published packages.

Original prompt

the genai-prompt package should have a Xamarin.Google.* namespace and not just the Google.* namespace. Can you fix that and check to make sure if there are others that are not consistent with the existing practice of prefixing Google with Xamarin.Google

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