feat(datasources): add Airtable datasource template

[robertmonka]

• Added Airtable datasource template

[entelligence-ai-pr-reviews]

EntelligenceAI PR Summary

Adds Airtable as a documented datasource in anton/core/datasources/datasources.md.

• Defines YAML configuration schema with engine, access_token, base_id, table_name (required), and view (optional) fields
• Provides a Python test snippet using httpx to validate connectivity via the Airtable list-records API (pageSize=1)
• Includes explanation of bearer-token authentication used for Airtable API access

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Confidence Score: 5/5 - Safe to Merge

Safe to merge — this PR introduces a new Airtable datasource template with no identified logic, security, or correctness issues flagged by review. The addition appears self-contained as a datasource configuration template, which limits blast radius and reduces integration risk. No pre-existing unresolved concerns were flagged, and the heuristic analysis found zero issues across all severity tiers.

Key Findings:

• No review comments were generated during analysis, indicating the template structure, field definitions, and configuration patterns follow established conventions for datasource templates in this codebase.
• As a new datasource template addition (rather than a modification of existing logic), the change is inherently low-risk — it extends functionality without altering existing code paths.
• The heuristic scan found zero critical, significant, or medium-severity issues, suggesting no obvious security concerns (e.g., credential exposure patterns, injection vectors) or logic flaws in the template definition.

[martyna-mindsdb]

Let's make these imports more compact like this:

import httpx, os
from urllib.parse import quote

[martyna-mindsdb]

Should table_name be a required parameter? If one wants to connect the entire database, this is a problem then. Can we make this param optional?