models(gallery): add archfunctions models

[mudler]

Description

This pull request adds new entries to the gallery/index.yaml file, introducing the Katanemo Arch-Function collection of large language models (LLMs). These models are designed for function calling tasks, achieving state-of-the-art performance.

New LLM entries:

• Added arch-function-1.5b model, including its description, tags, and file details. (gallery/index.yaml gallery/index.yamlR356-R408)
• Added arch-function-7b model, inheriting properties from arch-function-1.5b and specifying its own file details. (gallery/index.yaml gallery/index.yamlR356-R408)
• Added arch-function-3b model, inheriting properties from arch-function-1.5b and specifying its own file details. (gallery/index.yaml gallery/index.yamlR356-R408)

Notes for Reviewers

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