Adding zod validation

[CtrlAltGiri]

why

Adding zod validation errors in the error response to ensure better debugging for developers.

Resolving issue: #689

what changed

1. Adding a new ZodValidationError.
2. Stringifying the JSON in the ValidationError.

test plan

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Latest commit: 36b77de

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[greptile-apps]

PR Summary

Added Zod schema validation across LLM clients to provide consistent, type-safe response handling and improved error reporting.

• Added new types/zod.ts with validateZodSchemaWithResult utility for standardized schema validation
• Introduced CreateChatCompletionResponseValidationError for structured validation failures
• Implemented consistent validation in both GoogleClient and OpenAIClient with detailed error messages
• Added retry mechanism when validation fails in both LLM clients
• Aligned validation approach between providers while maintaining provider-specific response handling

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