Migrate from pyproject.toml to jac.toml

[SupulHeshan]

Add jac pip-install command for pip-style editable installation

Implements a new jac pip-install command that provides pip-style editable installation for Jac projects, similar to pip install -e . but using jac.toml configuration instead of pyproject.toml

Key Features:

• Editable installation with live source changes
• Support for dev and optional dependencies (--dev, -e <group>)
• Streams pip output in real-time
• Auto-generates and cleans up temporary pyproject.toml

# Install project in editable mode
jac pip-install jac-byllm

# Install with dev dependencies
jac pip-install jac-byllm --dev

# Install with specific optional dependency groups
jac pip-install jac-byllm -e tools
jac pip-install jac-byllm -e tools, video

# Verbose output
jac pip-install jac-byllm --dev --verbose

Test cases

pending...

[Copilot]

Pull request overview

This pull request implements a migration from pyproject.toml to jac.toml for Jac project configuration. It introduces a new pip-style editable installer that allows installing Jac projects in development mode using jac pip-install, similar to pip install -e .. The installer temporarily generates a pyproject.toml from the jac.toml configuration to work with pip's editable install mechanism.

Changes:

• Added new JacPipInstaller class for editable project installation with support for extras and dev dependencies
• Extended DependencyInstaller._run_pip() with parameters for working directory, verbose output, and streaming modes
• Implemented new CLI command jac pip-install with support for path, dev dependencies, extras, and verbose output
• Migrated jac-byllm package from pyproject.toml to jac.toml as a reference example

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 11 comments.

Show a summary per file

File	Description
jac/jaclang/project/pip_installer.jac	Interface definition for the new JacPipInstaller class and helper functions
jac/jaclang/project/impl/pip_installer.impl.jac	Implementation of editable installer with pyproject.toml generation from jac.toml
jac/jaclang/project/dependencies.jac	Extended _run_pip signature to support cwd, verbose, and stream_output parameters
jac/jaclang/project/impl/dependencies.impl.jac	Updated _run_pip implementation to handle new parameters for streaming output
jac/jaclang/cli/commands/project.jac	Added pip-install command declaration with arguments for path, dev, extras, no_deps, and verbose
jac/jaclang/cli/commands/impl/project.impl.jac	Implemented pip_install command with project discovery, config loading, and installer invocation
jac-byllm/pyproject.toml	Removed deprecated pyproject.toml configuration file
jac-byllm/jac.toml	New jac.toml configuration file with all project metadata and dependencies