feat: Add querychat_greeting()

[gadenbuie]

A function to help generate a greeting from a querychat config object

[Copilot]

Pull Request Overview

This PR adds a new querychat_greeting() function to help users generate greeting messages for their querychat bots. The function allows users to either retrieve existing greetings or generate new ones using the configured LLM, providing better flexibility and user experience.

• Added querychat_greeting() function in both R and Python packages
• Updated documentation and examples to reference the new greeting function
• Simplified greeting logic in the server module to use the new function

Reviewed Changes

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

Show a summary per file

File	Description
pyproject.toml	Added palmerpenguins dependency for examples
pkg-r/tests/testthat/test-querychat-greeting.R	Comprehensive test suite for R querychat_greeting function
pkg-r/man/querychat_server.Rd	Fixed spelling error "Initalize" → "Initialize"
pkg-r/man/querychat_init.Rd	Updated documentation to reference new greeting function
pkg-r/man/querychat_greeting.Rd	Documentation for new querychat_greeting function
pkg-r/R/querychat_greeting.R	Implementation of querychat_greeting function for R
pkg-r/R/querychat.R	Updated to use new greeting function and fixed spelling
pkg-r/NEWS.md	Added changelog entry for new feature
pkg-r/NAMESPACE	Exported new querychat_greeting function
pkg-py/tests/test_greeting.py	Test suite for Python greeting function
pkg-py/src/querychat/querychat.py	Updated documentation to reference new greeting function
pkg-py/src/querychat/_greeting.py	Implementation of greeting function for Python
pkg-py/src/querychat/init.py	Exported new greeting function
pkg-py/docs/index.qmd	Updated documentation with greeting function examples
pkg-py/CHANGELOG.md	Added changelog entry for new feature
.vscode/settings.json	Added pytest configuration

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