Add olive init cli

[xiaoyu-work]

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• Add unit tests for this change.
• Make sure all tests can pass.
• Update documents if necessary.
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[shaahji]

Few nit-picks

Please update the requirements file to include dependency on questionary

[Copilot]

Pull request overview

Adds a new interactive olive init CLI wizard (backed by questionary) to generate/run optimization commands for PyTorch, ONNX, and Diffusers models.

Changes:

• Introduces olive.cli.init wizard + per-framework flow modules (pytorch_flow, onnx_flow, diffusers_flow) and shared prompt/helpers.
• Registers the new init subcommand in the main CLI launcher.
• Adds a comprehensive new test suite for the wizard and flow command generation.

Reviewed changes

Copilot reviewed 15 out of 16 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
olive/cli/launcher.py	Registers the new init subcommand in the CLI entrypoint.
olive/cli/init/__init__.py	Implements InitCommand to run the interactive wizard.
olive/cli/init/wizard.py	Adds the interactive wizard that builds and optionally runs commands.
olive/cli/init/helpers.py	Shared prompt utilities, choices, and calibration arg builder.
olive/cli/init/pytorch_flow.py	PyTorch command builders/flows for optimize/export/quantize/finetune.
olive/cli/init/onnx_flow.py	ONNX command builders/flows for optimize/quantize/graph opt/tuning.
olive/cli/init/diffusers_flow.py	Diffusers command builders/flows for export and LoRA training.
olive/cli/optimize.py	Small fixes: wikitext flag rename; peephole optimizer gating change.
requirements.txt	Adds questionary dependency.
test/cli/init/*	New tests covering wizard behavior and command generation for flows.