feat: Add support for capturing SSL session keys via keyLog option

[parthverma1]

PR Checklist:

• I have run npm test locally and all tests are passing.
• I have added/updated tests for any new behavior.
  
• If this is a significant change, an issue has already been created where the problem / solution was discussed: [N/A, or add link to issue here]
  

PR Description

Adds support for SSL Keylogging

[Copilot]

Pull Request Overview

This PR adds SSL session key logging functionality to the request library through a new keyLog option, enabling users to capture TLS session keys for debugging purposes.

• Adds keyLog option support for capturing SSL session keys to a specified file
• Integrates the option into the agent configuration and connection pooling logic
• Updates documentation to describe the new feature

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
request.js	Implements keyLog option handling, agent configuration, and socket event listener for SSL key capture
README.md	Documents the new keyLog option in the API reference

Comments suppressed due to low confidence (1)

request.js:1

• The documentation should clarify that keyLog accepts a file path (string) and specify the format of the captured SSL session keys (typically NSS key log format).

'use strict'

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