Allow specifying seed when generating tokens in TypeScript API

[ruochenjia]

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Feature Request

Allow users to specify a seed in the TypeScript API, like what this API does in the LlamaContext interface.

Ideally this should be added to the LLModelPromptContext interface, which would allow users to use it when calling createCompletion function.

[cebtenzzre]

Similar request to #1923

[tripolskypetr]

Damn it when you mark issue as similar you should resolve it, the duplicate mark is not the answer, it just showing that problem should have maximum priority!