Replaced the anonymous request shapes of the runtime calls with records

app/Tests/Serialization/Fixtures/runtime-count-tokens-request.json

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+{"text":"Count these tokens.","tokenizer_path":"/samples/tokenizer.json"}

app/Tests/Serialization/Fixtures/runtime-delete-tokenizer-request.json

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+{"model_id":"model-a"}

app/Tests/Serialization/Fixtures/runtime-prepare-image-for-model-request.json

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+{"path":"/samples/picture.png","max_bytes":5242880}

app/Tests/Serialization/Fixtures/runtime-prepare-image-request.json

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+{"path":"/samples/picture.png","optimize":true}

app/Tests/Serialization/Fixtures/runtime-store-tokenizer-request.json

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+{"model_id":"model-a","file_path":"/samples/tokenizer.json"}

app/Tests/Serialization/Fixtures/runtime-validate-tokenizer-request.json

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+{"file_path":"/samples/tokenizer.json"}