feat: compile CI to a binary with bun

[cabljac]

This is a draft PR to:

• make the cli compatible with bun
• add CI to compile genkit-tools cli to binary targets using bun
• push those binaries somewhere (to be decided)

Checklist (if applicable):

• PR title is following https://www.conventionalcommits.org/en/v1.0.0/
• Tested (manually, unit tested, etc.)
• Docs updated (updated docs or a docs bug required)

[cabljac]

I will move this out to ../commands, just here for now while in draft.

[cabljac]

this is required as the package.json is included in the build now, which lives above src

[Copilot]

Pull Request Overview

This draft PR introduces changes to enable compiling the CLI into binaries using Bun and integrates a new CI workflow to build and test these binaries on multiple platforms. Key changes include:

• Updates to tsconfig and package.json files to support Bun-specific compiler options and type definitions.
• Refactoring of error handling utilities and removal of legacy argument parsing in favor of Commander commands.
• Addition of a new GitHub Actions workflow for building and testing CLI binaries.

Reviewed Changes

Copilot reviewed 11 out of 13 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
genkit-tools/common/tsconfig.json	Added "resolveJsonModule" and a trailing comma for proper JSON configuration.
genkit-tools/common/src/utils/utils.ts	Refactored error handling to use the new isConnectionRefusedError helper.
genkit-tools/common/src/utils/package.ts	Simplified package import by using direct JSON import instead of file system reads.
genkit-tools/common/src/utils/errors.ts	Added utility functions to normalize error handling across Node.js and Bun environments.
genkit-tools/common/package.json	Updated types paths in exports and added "bun-types" as a dependency.
genkit-tools/cli/tsconfig.json	Included "bun-types" and enabled "resolveJsonModule" for improved module resolution.
genkit-tools/cli/src/utils/server-harness.ts	Replaced legacy argument parsing with a Commander command for starting the server and redirecting output.
genkit-tools/cli/src/commands/ui-start.ts	Updated to spawn the process using process.execPath along with the new CLI command interface.
genkit-tools/cli/src/cli.ts	Integrated the new uiStartServer command based on process arguments.
genkit-tools/cli/package.json	Introduced a new "compile:bun" script and updated Bun-related dependencies.
.github/workflows/build-cli-binaries.yml	Added a CI workflow to compile CLI binaries across various OS and architecture targets using Bun.

Files not reviewed (1)

• genkit-tools/pnpm-lock.yaml: Language not supported