Draft: Javascript package decomposition

[Reversean]

Closes #151

@hawk.so/javascript decomposed into 2 packages:

1. @hawk.so/core

• Location: packages/core/
• Exports:
  • EventRejectedError - Error class for rejected events
  • Sanitizer - Data sanitization class (environment-agnostic)
  • isErrorProcessed, markErrorAsProcessed - Error tracking utilities
  • validateUser, validateContext - Validation utilities
  • log - Logger utility (environment-agnostic)

2. @hawk.so/browser

• Location: packages/browser/
• Contains: All browser-specific code:
  • catcher.ts - Main Catcher class
  • modules/socket.ts - WebSocket transport
  • modules/stackParser.ts - Stack trace parsing
  • modules/fetchTimer.ts - Fetch with timeout
  • addons/breadcrumbs.ts - Breadcrumb tracking
  • addons/consoleCatcher.ts - Console interception
  • integrations/vue.ts - Vue.js integration
  • Dependencies: Uses @hawk.so/core for shared utilities

Also updated workspaces in root package.json.

Also @hawk.so/sveltekit now depends on @hawk.so/browser.