[PLT-1151] Vb/model setup complete

[vbrodsky]

Description

Provides support for a call to 'complete' chat model evaluation project, thus preventing new model configs from being added / removed. This will make sure sdk can support full model evaluation projects lifecycle on par with the UI

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Document change (fix typo or modifying any markdown files, code comments or anything in the examples folder only)

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Changes to Core Features

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