feat: migrate feeds to use clickhouse client

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What does this PR do?

🤖 Generated by Copilot at 665058f

This pull request updates the feeds worker to use the new @hey/clickhouse package for querying clickhouse data. This improves the performance and reliability of the feed algorithms and simplifies the configuration of the environment variables and the deployment. The old clickhouse REST client and the related code and files are removed.

Related issues

Fixes # (issue)

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Enhancement (non-breaking small changes to existing functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Explanation of the changes

🤖 Generated by Copilot at 665058f

• Replace the old clickhouse REST client with the new clickhouse TCP client from the @hey/clickhouse package (link, link)
• Import the createClickhouseClient function from the @hey/clickhouse package in the algorithm files (link, link)
• Delete the clickhouseQuery function that was a wrapper around the old REST client (link, link, link)
• Update the heyMostInteracted and heyMostViewed algorithms to use the new clickhouse client and the JSONEachRow format for the query results (link, link, link)
• Update the Env interface and the wrangler.toml file to use the CLICKHOUSE_PASSWORD environment variable instead of the CLICKHOUSE_REST_ENDPOINT (link, link)
• Update the example file for the feeds worker to use the CLICKHOUSE_PASSWORD environment variable (link)

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