blocks(exa): Add more Exa blocks

[aarushik93]

Revamp the Exa search block and add two more for Content and Similarity search.

Changes 🏗️

• Updated the exa search block input names to be snakecase not camel case
• Added Advanced to non required fields
• Pulled Content settings into helpers for reuse across blocks
• Updated customnode.css to handle long inputs, especially in the case of the date input

Checklist 📋

For code changes:

• I have clearly listed my changes in the PR description
• I have made a test plan
• I have tested my changes according to the test plan:
  • ...

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[qodo-merge-pro]

PR Reviewer Guide 🔍

Here are some key observations to aid the review process:

⏱️ Estimated effort to review: 3 🔵🔵🔵⚪⚪

🧪 No relevant tests

🔒 Security concerns API Key Exposure: The code handles API keys through credentials.api_key.get_secret_value(). While the key is not directly exposed in logs or responses, ensure that error handling does not accidentally expose the API key in error messages or stack traces.

⚡ Recommended focus areas for review Error Handling The error handling in the run method could be improved. Currently it catches all exceptions generically and yields both an error and empty results. Consider handling specific exceptions separately and providing more detailed error information. Input Validation The include_text and exclude_text fields have constraints (max 1 string, up to 5 words) that are documented but not enforced in the code. Consider adding validation logic to ensure these constraints are met. Code Duplication The date and field mapping logic is duplicated across multiple blocks. Consider extracting this common functionality into a shared helper module.