Add new handler implementation and shared interfaces

[witoszekdev]

• Simplify tsconfig, add aliases
• Refactor handlers/next -> handlers/platform/next
• Fix imports
• Move to shared
• Fix vitest config
• Fix failing tests due to change in aliases
• Add missing shared files
• Move sync-webhook response builder
• Refactor commonly used types to shared folder
• Add deprecated exports notes, add index file
• Export shared folder
• Fix broken build
• Fix broken build
• Remove re-exports for compatibility
• Add more shared logic: adapter, validator
• Add exports, remove saleor domain middleware

[changeset-bot]

⚠️ No Changeset found

Latest commit: 95c2e6b

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[codecov]

Codecov Report

Attention: Patch coverage is 34.31856% with 400 lines in your changes missing coverage. Please review.

Project coverage is 66.88%. Comparing base (90ea84e) to head (95c2e6b).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/handlers/shared/protected-action-validator.ts	0.00%	147 Missing and 1 partial ⚠️
src/handlers/shared/generic-saleor-webhook.ts	0.79%	125 Missing ⚠️
src/handlers/shared/adapter-middleware.ts	25.00%	33 Missing ⚠️
...andlers/platforms/next/create-protected-handler.ts	3.12%	31 Missing ⚠️
src/handlers/shared/saleor-webhook-validator.ts	81.16%	29 Missing ⚠️
src/handlers/shared/protected-handler.ts	9.09%	10 Missing ⚠️
.../handlers/shared/generic-adapter-use-case-types.ts	0.00%	8 Missing and 1 partial ⚠️
src/handlers/shared/index.ts	0.00%	8 Missing and 1 partial ⚠️
...handlers/platforms/next/create-manifest-handler.ts	79.16%	5 Missing ⚠️
src/handlers/platforms/next/index.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #400      +/-   ##
==========================================
- Coverage   73.04%   66.88%   -6.17%     
==========================================
  Files          78       88      +10     
  Lines        3024     3521     +497     
  Branches      454      493      +39     
==========================================
+ Hits         2209     2355     +146     
- Misses        810     1159     +349     
- Partials        5        7       +2     

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