feat: Import file contents from recipe 'file' input type parameter

[jsibbison-square]

Pull Request Description

Implements and closes #4475

Implements the 'file' parameter type for recipes. It will include the content of the filepath provided in the parameter into the recipe at the templated location.

Includes:

• relative and absolute paths are supported
• rejects file parameters if a default value is provided to prevent malicious repices from default loading a file

Testing

Sample recipe for testing from the root of the repo:

version: 1.0.0
title: "file content import"
description: "Imports file contents from parameter path"
instructions: |
  {{ joke_file_path | indent(2) }}
prompt: What was the specific joke?
parameters:
  - key: joke_file_path
    input_type: file
    requirement: required
    description: "The file to read"

./target/debug/goose run --recipe recipe.yaml --params joke_file_path=JOKES.md

The recipe will print the content of JOKES.md without extra tool calls as the content is already included. Works with relative and absolute paths.

UI

Note this does not change any of the functionality in the UI, 'file' parameters are still just strings. The frontend has entirely different parameter handling entirely built directly into the frontend :(. This will be rectified as we move recipe logic over to the backend.