Quickstart guide for building analytics with Snowflake and Explo

[annettechen]

This creates a new quickstart guide for connecting Snowflake data to Explo, and beginning to build dashboards and reports to visualize Snowflake data in Explo.

I accept the CLA, with the contribution being limited to the files in this pull request.

[github-actions]

⚠️ Validation Failed

🌐 Language Validation Failed

Invalid or missing language detected. Allowed: en, es, it, fr, de, ja, ko, pt_br

• build_analytics_with_explo_and_snowflake: ""

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🏷️ Category Syntax Validation Failed

Expected categories like 'snowflake-site:taxonomy/x/y'.

• pr/site/sfguides/src/build_analytics_with_explo_and_snowflake/build_analytics_with_explo_and_snowflake.md: Analytics, Getting-Started, Partner-Integrations

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📄 Frontmatter Validation Failed

Frontmatter id must be slugified and match file and folder.

• pr/site/sfguides/src/build_analytics_with_explo_and_snowflake/build_analytics_with_explo_and_snowflake.md: id must be slugified (lowercase letters/digits, single dashes); id must match filename ('build_analytics_with_explo_and_snowflake'); id must match folder name ('build_analytics_with_explo_and_snowflake')

Please fix the issues above before merging.