Deprecate request/requestretry – Switch to Axios/axios-retry, Add Central getStream Helper

[yashkohli88]

Overview

This PR migrates away from the deprecated request and requestretry libraries in favor of an axios-based solution (axios, axios-retry). A new helper, getStream, is introduced to handle streaming downloads across package fetchers, reducing maintenance burden and improving long-term support.

Main Changes

• Refactor Download Logic:
  Replaces usage of request in all package fetchers (conda, debian, go, maven, npm, composer, pypi, ruby) with a new getStream helper in lib/fetch.js.
• Retry Logic Update:
  Replaces requestretry with axios-retry for HTTP retry support. Centralizes retry logic in callFetchWithRetry.
• Code Simplification & Maintenance:
  Removes now-unnecessary callback-based code and error handling, moving to promise-based, modern patterns.
• Test Enhancements:
  Updates unit tests and stubs to use new axios-based methods and async/await.
• API Consistency:
  All fetchers now consistently return streams and/or promise-based results.
• Exponential Backoff Support:
  Adds exponential delay to retries.

Notable File/Code Changes

• lib/fetch.js
  • Adds getStream and callFetchWithRetry.
  • Switches HTTP requests and retry to axios + axios-retry.
• *All providers/fetch/Fetch.js
  • Refactored from request/requestretry to the new helpers.
  • Error handling and stream logic updated to promises and async/await.
• package.json
  • Removes request and requestretry dependencies.
• Tests
  • Refactored all related test stubs and mocks to support new interfaces.

Backwards Compatibility

• Code maintains the same external behavior for package downloads and retries; only the underlying HTTP/request implementation has changed.