chore: adding shopify oxygen example

[joker23]

This PR will add an example application for Shopify Oxygen SDK

---

Note

Adds a runnable Shopify Oxygen SDK example (with mini-oxygen runner) and includes it in the root workspaces.

• Examples:
  • Shopify Oxygen SDK example in packages/sdk/shopify-oxygen/example:
    • src/index.ts: Minimal worker that initializes @launchdarkly/shopify-oxygen-sdk, evaluates a flag, and returns JSON.
    • app.ts: Local runner using @shopify/mini-oxygen to repeatedly invoke the worker and print results.
    • README.md: Setup and run instructions.
    • Build setup: package.json (scripts/deps), tsconfig.json, tsup.config.ts.
• Repo:
  • Update root package.json workspaces to include packages/sdk/shopify-oxygen/example.

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[github-actions]

@launchdarkly/browser size report
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Uncompressed size: 789399 bytes

[github-actions]

@launchdarkly/js-sdk-common size report
This is the brotli compressed size of the ESM build.
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Uncompressed size: 122411 bytes

[github-actions]

@launchdarkly/js-client-sdk size report
This is the brotli compressed size of the ESM build.
Compressed size: 21981 bytes
Compressed size limit: 25000
Uncompressed size: 75580 bytes

[github-actions]

@launchdarkly/js-client-sdk-common size report
This is the brotli compressed size of the ESM build.
Compressed size: 17636 bytes
Compressed size limit: 20000
Uncompressed size: 90259 bytes