feat(cloudflare): use functions instead of classes for static bindings

[sam-goodwin]

Closes #567

Migration to Function-Based API

Migrated several Cloudflare bindings from class-based to function-based syntax for consistency across the codebase. This change affects the following bindings:

Usage Changes

Before:

const ai = new Ai()
const analytics = new AnalyticsEngineDataset("analytics", {...})
const browser = new BrowserRendering()
const durable = new DurableObjectNamespace("namespace", {...})
const images = new Images()
const metadata = new VersionMetadata()
const workflow = new Workflow("workflow", {...})

After:

const ai = Ai()
const analytics = AnalyticsEngineDataset("analytics", {...})
const browser = BrowserRendering()
const durable = DurableObjectNamespace("namespace", {...})
const images = Images()
const metadata = VersionMetadata()
const workflow = Workflow("workflow", {...})

No functional changes were made - this is purely a syntactic update for consistency. All types and runtime behavior remain the same.

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commit: b06c3c9

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