### Motivation and Context  Introducing Handlebars templating to the Python Semantic Kernel! Closes: #5446 Prework for: #4641 ### Description  Adds HandlebarsPromptTemplate as a subclass of PromptTemplateBase Adds second literal to the PromptTemplateConfig definition Adds helpers for Handlebars (system_helpers) and `create_helper_from_function` function Moves fully_qualified_name into KernelFunctionMetadata instead of in different extensions. Defaults are still 'semantic-kernel' templates, and without making explicit changes that still is the norm. Adds a azure_chat_gpt_handlebars.py sample ### Contribution Checklist  - [x] The code builds clean without any errors or warnings - [x] The PR follows the [SK Contribution Guidelines](https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md) and the [pre-submission formatting script](https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md#development-scripts) raises no violations - [x] All unit tests pass, and I have added new tests where possible - [x] I didn't break anyone 😄

Python: Introduce Handlebars planner #4641

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