feat: add navigation-api router

[userquin]

Right now I'm playing with it, once the features added we can start adding compatibility.

Looks like I've finished it, will need to review view transitions at legacy router an prepare some tests here: will port #2552 PR to this PR to add some tests and a new playground.

You can play with the new Navigation API Router in my GH repo using this branch: https://github.com/userquin/vue-router-api/tree/nav-api-vue-router

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npm i https://pkg.pr.new/vue-router@2551

commit: 11632e0

[codecov]

Codecov Report

❌ Patch coverage is 7.89238% with 1027 lines in your changes missing coverage. Please review.
✅ Project coverage is 71.10%. Comparing base (6171856) to head (11632e0).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
packages/router/src/navigation-api/index.ts	0.25%	781 Missing ⚠️
packages/router/src/router.ts	20.47%	101 Missing ⚠️
packages/router/src/focus.ts	4.81%	79 Missing ⚠️
packages/router/src/utils/routes.ts	13.51%	32 Missing ⚠️
packages/router/src/modern-router-factory.ts	8.33%	22 Missing ⚠️
packages/router/src/navigationGuards.ts	76.74%	10 Missing ⚠️
packages/router/src/transition.ts	71.42%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2551       +/-   ##
===========================================
- Coverage   94.80%   71.10%   -23.71%     
===========================================
  Files          34       39        +5     
  Lines        3004     4094     +1090     
  Branches      846      851        +5     
===========================================
+ Hits         2848     2911       +63     
- Misses        153     1180     +1027     
  Partials        3        3               

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[userquin]

Maybe we can use a vue plugin for enableViewTransition, this way Nuxt can register the plugin (its current plugin can be simplified a lot with latest features added here)

[userquin]

arggg, back/forward view transitions broken, reviewing code