feat/multi provider support

[DYung26]

This pull request introduces major updates to the PlotSense package, focusing on expanding AI provider support, updating documentation, and improving package metadata and dependencies. The most significant changes include the addition of new LLM provider integrations (Groq, Anthropic, Gemini, and Azure OpenAI), enhancements to the documentation and usage examples, and updates to package requirements and author/license information.

AI Provider Integrations

• Added new provider classes for Groq (plotsense/core/providers/groq.py), Anthropic (plotsense/core/providers/anthropic.py), Gemini (plotsense/core/providers/gemini.py), and Azure OpenAI (plotsense/core/providers/azure_openai.py), all inheriting from a new abstract base class LLMProvider (plotsense/core/providers/base.py). These classes support querying, model listing, and API key validation for each respective service. [1] [2] [3] [4] [5]

• Introduced a new StrategyName enum to support future provider selection strategies (plotsense/core/enums/strategy.py).

Documentation and Usage Improvements

• Expanded the PKG-INFO documentation with new usage examples for plot generation (plotgen), improved explanation workflow, and a combined workflow for suggest → plot → explain. Updated sample outputs and added a feedback form link. [1] [2] [3] [4]

Package Metadata and Requirements

• Updated package metadata: new version (0.1.3), expanded author list, changed license to Apache License 2.0, and revised homepage/documentation links. [1] [2]
• Added new dependencies for AI providers (groq, anthropic, openai, google-genai, python-dotenv, requests) and updated minimum required version for matplotlib to 3.8.0. [1] [2]

Source and Test Structure

• Added new source files for provider integrations, plot generation, and suggestion modules in SOURCES.txt, and included new test files for expanded coverage. [1] [2] [3]

Minor API and Import Updates

• Updated main package imports in plotsense/__init__.py to ensure new modules are available.

These changes significantly enhance PlotSense's flexibility and capability to interact with multiple AI providers, improve user experience through better documentation, and ensure the package is up to date with modern requirements.