Show App Events extension status in dev sessions

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TL;DR

Show analytics_app_events Extension loaded after Shopify CLI successfully creates or updates a dev session containing an Analytics App Events extension.

Context

analytics_app_events is currently a remote-only extension specification. Shopify CLI includes its TOML configuration in the dev-session flow, but the extension has neither client build steps nor a getDevSessionUpdateMessages hook, so it is silent after Ready.

Changes

• Register a thin local, contract-based analytics_app_events specification that returns Extension loaded through the existing dev-session message hook.
• Let contract-based specifications opt into that existing hook without changing the default behavior of any other extension type.
• Retain the remote platform JSON schema as the source of truth for App Events configuration validation.
• Add coverage for the exact handle-prefixed message, remote-schema merging, and silence for a representative existing contract-based extension.

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Image of it appearing locally.