Add Makefile, separate core and development requirements

[namasl]

In this PR:

• Separate core and development requirements into requirements.txt and requirements-dev.txt
• Create a Makefile for performing common tasks

I kept black as the linter unchanged, but added ruff as a formatter and mypy as a type checker for consistency with Inference Perf (however, they are running with default options here).

[Copilot]

Pull Request Overview

This PR separates core and development dependencies into distinct requirement files, adds a Makefile to automate common project tasks, and updates the CI to install development requirements.

• Split dependencies into requirements.txt (core) and requirements-dev.txt (development).
• Introduced a Makefile with targets for venv creation, formatting, linting, type-checking, testing, and cleanup.
• Updated GitHub Actions workflow to install dev dependencies before running tests.

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
requirements-dev.txt	Added development tools: black, mypy, pytest, ruff, and wheel
Makefile	New Makefile with targets for setup, format, lint, type-check, test, etc.
.github/workflows/unittests.yml	Install requirements-dev.txt in CI before running tests

Comments suppressed due to low confidence (1)

Makefile:59

• The Makefile uses --strict for type checking but the PR description mentions default options; please align the description or adjust the flags for consistency.

mypy --strict ./fmperf

[wangchen615]

/LGTM