feat: Support compressed requests in the RPT client

[davidkna-sap]

Context

Closes SAP/ai-sdk-js-backlog#470.
Needs SAP/cloud-sdk-js#6291

What this PR does and why it is needed

[davidkna-sap]

Caution

Vendored from SAP/cloud-sdk-js#6291

[hyperspace-insights]

Summary

The following content is AI-generated and provides a summary of the pull request:

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Support Compressed Requests in the RPT Client

New Features

✨ Request Compression Support: The RPT client now automatically compresses prediction requests with payloads of 1024 bytes or larger using gzip compression by default. This feature helps reduce network bandwidth usage and improve request performance for large datasets.

✨ Custom HTTP Request Configuration: Added support for custom HTTP request options through the new customRequest parameter in predictWithSchema() and predictWithoutSchema() methods, enabling configuration of headers, timeout, middlewares, and compression settings.

Changes

• .changeset/new-tigers-guess.md: Added changelog entry for generic HTTP request configuration support via RptRequestOptions parameter
• .changeset/true-dolls-say.md: Added changelog entry for automatic request compression feature with configurable compression settings
• packages/rpt/package.json: Added @sap-cloud-sdk/http-client dependency for HTTP client functionality
• packages/rpt/src/client.ts:
  • Refactored executePrediction() to use executeRequest() from @sap-ai-sdk/core instead of generated API client
  • Added customRequest parameter to predictWithSchema() and predictWithoutSchema() methods
  • Integrated compression middleware that automatically applies gzip compression to requests meeting size threshold
  • Added support for configurable compression via requestCompression option
• packages/rpt/src/index.ts: Exported new types RptRequestOptions, RptRequestCompressionAlgorithm, RptRequestCompressionMiddlewareOptions, and RequestCompressionMiddlewareOptions
• packages/rpt/src/types.ts:
  • Defined RptRequestCompressionAlgorithm type (currently supporting 'gzip')
  • Added RptRequestCompressionMiddlewareOptions interface for compression configuration
  • Created RptRequestOptions interface extending CustomRequestConfig with compression support
• packages/rpt/src/vendor/compress-request-middleware.ts: Vendored compression middleware implementation supporting multiple algorithms (gzip, brotli, deflate, zstd) with configurable compression modes and thresholds
• packages/rpt/src/vendor/index.ts: Created vendor module barrel export
• sample-code/src/index.ts: Exported new predictWithSchemaCompressed sample function
• sample-code/src/rpt.ts: Added predictWithSchemaCompressed() example demonstrating forced compression with configurable algorithm
• tests/e2e-tests/src/rpt.test.ts: Added end-to-end test validating gzip compression functionality

GitHub Issues:

• SAP/ai-sdk-js-backlog#470: chore(deps): Bump express from 4.21.1 to 4.21.2

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PR Bot Information

Version: 1.17.50 | 📖 Documentation | 🚨 Create Incident | 💬 Feedback

• Correlation ID: 9eadea30-01cc-11f1-8708-47761a5d887e
• Output Template: Default Template
• GithubContextProvider: chore(deps): Bump express from 4.21.1 to 4.21.2 #470
• LLM: anthropic--claude-4.5-sonnet
• Event Trigger: issue_comment.created
• Summary Prompt: Default Prompt

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[hyperspace-insights]

The code quality is generally good with clear intent and proper typing. A few naming inconsistencies and a grammatical error in documentation should be addressed for clarity and maintainability.

PR Bot Information

Version: 1.17.50 | 📖 Documentation | 🚨 Create Incident | 💬 Feedback

• Event Trigger: issue_comment.created
• LLM: anthropic--claude-4.5-sonnet
• Correlation ID: a1e74340-01cc-11f1-8ba4-2cd32fc9729d