Add bryan case vapor function

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Pull request overview

This PR adds a new saturation vapor pressure formulation for water (“Bryan” liquid-branch form), wires it into the function-dispatch registry (CPU + CUDA), and introduces unit tests to validate both the direct function and the LogSVPFunc dispatch path.

Changes:

• Added h2o_bryan(T) and h2o_bryan_ddT(T) vapor functions.
• Registered the new functions in the CPU and CUDA function tables and exposed their names for string-based dispatch.
• Added a new GTest suite covering numeric correctness, below-triple-point behavior, and LogSVPFunc routing.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tests/test_vapor_functions.cpp	Adds unit tests validating h2o_bryan and its derivative, including dispatch through LogSVPFunc.
tests/CMakeLists.txt	Registers the new vapor-functions test target with the test suite.
src/vapors/vapor_functions.h	Implements h2o_bryan and h2o_bryan_ddT using the existing logsvp_ideal* helpers.
src/func_table.cu	Adds CUDA-side function pointers for h2o_bryan and h2o_bryan_ddT in the device dispatch table.
src/func_table.cpp	Adds CPU-side function pointers and name registry entries for the new Bryan functions.

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