Refactor handlers folder structure

[witoszekdev]

• Separated shared types to separate shared folder
• Moved platform handlers to platform folder, leaving public imports unchanged
• Added re-exports in platform/next for backwards compatibility (to be removed in v1)
• Added @/ alias, updated tests to support it

[changeset-bot]

⚠️ No Changeset found

Latest commit: 10f462f

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[codecov]

Codecov Report

Attention: Patch coverage is 65.60000% with 43 lines in your changes missing coverage. Please review.

Project coverage is 73.67%. Comparing base (cd902b5) to head (10f462f).
Report is 3 commits behind head on v0.x.

Files with missing lines	Patch %	Lines
...andlers/platforms/next/create-protected-handler.ts	3.12%	31 Missing ⚠️
src/handlers/shared/index.ts	0.00%	5 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             @@
##             v0.x     #396      +/-   ##
==========================================
+ Coverage   73.37%   73.67%   +0.29%     
==========================================
  Files          79       84       +5     
  Lines        3061     3073      +12     
  Branches      457      458       +1     
==========================================
+ Hits         2246     2264      +18     
+ Misses        810      804       -6     
  Partials        5        5              

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[witoszekdev]

FYI: Codecov is calculated incorrectly, because we haven't added new code, rather moving it to different place ;)

[witoszekdev]

Closed, since we don't actually need this changes for v0, we'll have a migration guide prepared