feat(mdm): add brew, python, IDE plugin scanning with upload resilience

[shubham-stepsecurity]

What does this PR do?

Consolidates and supersedes three individual PRs into a single, reviewed branch:

• feat(mdm): analyze for brew & python packages #19 — Brew & Python package scanning: detects Homebrew formulae/casks and Python projects with
  virtual environments, including raw scan output for enterprise telemetry.
• feat(mdm): add support for new ide & pluggins #22 — Extended IDE & plugin detection: adds support for JetBrains IDEs, Xcode Source Editor
  extensions, and Eclipse plugins with bundled/user-installed source tagging.
• feat: implement S3 upload with retry mechanism and extended timeout #24 — S3 upload retry mechanism: introduces a retry loop with backoff and extended timeout for
  telemetry uploads to handle transient network failures.

Additionally addresses Copilot review feedback from all three PRs:

• Populated missing PerformanceMetrics fields (brew formulae/cask counts, python global
  packages/project counts).
• Fixed retry logging to include the actual error value instead of only elapsed time.
• Replaced time.Sleep with context-aware backoff so retries respect cancellation during shutdown.

Closes #19, closes #22, closes #24.

Type of change

• Bug fix
• Enhancement
• Documentation

Testing

• Tested on macOS (version: ___)
• Binary runs without errors: ./stepsecurity-dev-machine-guard --verbose
• JSON output is valid: ./stepsecurity-dev-machine-guard --json | python3 -m json.tool
• No secrets or credentials included
• Lint passes: make lint
• Tests pass: make test

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