[Feature Request] Add Python module for detecting T1087.003

[seth-goodwin]

🐍 Python Module for MITRE ATT&CK Technique Detection

Technique Name: Account Discovery: Email Account

Technique ID: T1087.003

Technique Description: Adversaries may attempt to get a listing of email addresses and accounts. This internal identity enumeration can then be used to target further post-exploitation collection against accounts with placement and access to desired information.

Please ensure the following tasks are completed before submitting your feature request:

• This issue is for a specific MITRE ATT&CK technique detection
• The technique name and ID are clearly specified
• The problem and desired solution are clearly described
• Any necessary alternatives or additional context have been provided