feat: add impressions worker

[bigint]

• feat: remove old impressions that updates state yikes
• feat: add impressions worker

What does this PR do?

🤖 Generated by Copilot at ac792d4

This pull request simplifies the web app components by removing unused code and state, and improves the impressions tracking feature by replacing the WebSocket logic with a service worker. It also adds a new impressions worker package that handles the ingestion of impressions data into the Clickhouse database, and updates the documentation and configuration accordingly.

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 ac792d4

• Rename postsEndpoint to impressionsEndpoint and update its value in impressions.js (link)
• Remove useLeafwatchStore and setViewedPublication from various components and use navigator.serviceWorker.controller.postMessage instead to send visible publications to the service worker (link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link, link)
• Delete useLeafwatchStore.ts as it is no longer used (link)
• Remove impressions service port and add impressions worker port to ports.md (link, link)
• Rename .env.example to .dev.vars.example in impressions worker package (link)
• Remove ignorePatterns from .eslintrc.js in impressions worker package (link)
• Delete .gitignore in impressions worker package as it is redundant (link)
• Add README.md to impressions worker package with introduction and schema (link)
• Modify package.json in impressions worker package with name, scripts, dependencies, and devDependencies (link)
• Delete app.ts in impressions worker package as it is unnecessary (link)
• Add ingest.ts to impressions worker package with handler function for /ingest endpoint (link)
• Add buildRequest.ts to impressions worker package with helper function to build custom request object (link)
• Add index.ts to impressions worker package with main entry point and fetch function (link)
• Delete ingestImpression.ts in impressions worker package as it is replaced by ingest.ts (link)

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Name	Status	Preview	Updated (UTC)
prerender	✅ Ready (Inspect)	Visit Preview	Nov 8, 2023 7:49am
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