Minor tweaks to retrieval skill and file ingestion

[dusvyat]

Description

1. The default chunk size and overlap values in file_handler have been increased for better performance.
2. In langchain_handler, checks have been added to use the same provider and model for embeddings if 'embedding_model_args' are not provided in input params.
3. Skill_tool's retriever_config has been renamed to 'config' for clarity.
4. Catch LLM output parser errors and return response if relevant or raise error if genuine error.

Fixes #issue_number

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 not to work as expected)
• 📄 This change requires a documentation update

Verification Process

To ensure the changes are working as expected:

• Test Location: Specify the URL or path for testing.
• Verification Steps: Outline the steps or queries needed to validate the change. Include any data, configurations, or actions required to reproduce or see the new functionality.

Additional Media:

• I have attached a brief loom video or screenshots showcasing the new functionality or change.

Checklist:

• My code follows the style guidelines(PEP 8) of MindsDB.
• I have appropriately commented on my code, especially in complex areas.
• Necessary documentation updates are either made or tracked in issues.
• Relevant unit and integration tests are updated or added.

[dusvyat]

cc @ZoranPandovski

[tmichaeldb]

Nice changes, let's get this merged for the hackathon