minor api refactor - just an initial PR as a test

[jaggederest]

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[Copilot]

Pull Request Overview

This PR refactors the API module by centralizing configuration access, extracting helper routines for file/path management, and unifying streaming logic.

• Added config, path, cert/key getters, and readFile helpers to reduce repetition
• Refactored needToken and createHttpAgent to use new helpers
• Extracted shared stream‐to‐ReadableStream code into getStreamFromResponse and updated the fetch adapter

Comments suppressed due to low confidence (2)

src/api.ts:41

• [nitpick] The name checkEmptyString suggests a boolean return; rename this to something like nonEmptyStringOrUndefined to clarify its behavior.

function checkEmptyString(str: string): string | undefined {

src/api.ts:187

• [nitpick] Indentation here is inconsistent with surrounding code; aligning this block will improve readability.

const getHeaderFromResponse = (name: string) => {