Gigachat 3 tool parser and tests

[ajpqs]

Motivation

This PR adds a tool parser for parsing the function calls made by the Gigachat 3 models.
Models can generate only one function call using format:

{text}<|message_sep|>\n\nfunction call<|role_sep|>\n{json}

Where <|message_sep|>\n\n and <|role_sep|>\n are special tokens.

Modifications

Add Gigachat 3 parser and unite tests to it. PR doesnt affects any existing code or tests.

Accuracy Tests

Benchmarking and Profiling

Checklist

• Format your code according to the Format code with pre-commit.
• Add unit tests according to the Run and add unit tests.
• Update documentation according to Write documentations.
• Provide accuracy and speed benchmark results according to Test the accuracy and Benchmark the speed.
• Follow the SGLang code style guidance.
• Work with maintainers to merge your PR. See the PR Merge Process

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[ajpqs]

@CatherineSue @JustinTong0323

[ajpqs]

Hi @CatherineSue @JustinTong0323, could you please take a look at this PR when you have a chance? Thanks!

[ajpqs]

Hi @CatherineSue @JustinTong0323, could you please take a look at this PR when you have a chance? Thanks!

[Kangyan-Zhou]

/tag-and-rerun-ci

[Kangyan-Zhou]

@ajpqs could you please attach the result of test/registered/function_call/test_function_call_parser.py for this PR? I think once verified it should be ready to merge.

[ajpqs]

@Kangyan-Zhou

python -m pytest sglang/test/registered/function_call/test_function_call_parser.py::TestGigaChat3Detector

Output:

=============================================================================== test session starts ===============================================================================
platform linux -- Python 3.12.3, pytest-9.0.2, pluggy-1.6.0
configfile: pytest.ini
plugins: anyio-4.12.0
collected 21 items                                                                                                                                                                

sglang/test/registered/function_call/test_function_call_parser.py .....................                                                   [100%]

========================================================================= 21 passed in 122.80s (0:02:02) ==========================================================================