feat(extendRoutes): allow relative path overrides

[robertmoura]

BREAKING CHANGE: allow relative path overrides

Closes #341

• Support relative paths for EditableTreeNode
• Require absolute paths at the base of the tree and the root's children
• Support relative paths in definePage and <route> block

Includes changes from #431

Description

Relative paths in definePage and route block

Relative paths are converted to absolute paths. Here is an example:

src/pages/
├─ custom-root.vue
├─ layout.vue
└─ layout/
	└─ empty-folder/
		└─ custom-child.vue

custom-root.vue

// Absolute path is '/i-am-custom'
definePage({
    path: 'i-am-custom',
});

custom-child.vue

// Absolute path is '/layout/i-am-custom'
definePage({
    path: 'i-am-custom',
});

[codecov]

Codecov Report

Attention: Patch coverage is 64.00000% with 9 lines in your changes missing coverage. Please review.

Project coverage is 68.15%. Comparing base (5741b2a) to head (a930a2d).

Files with missing lines	Patch %	Lines
src/core/context.ts	35.71%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #519      +/-   ##
==========================================
+ Coverage   67.56%   68.15%   +0.59%     
==========================================
  Files          31       31              
  Lines        3074     3084      +10     
  Branches      601      611      +10     
==========================================
+ Hits         2077     2102      +25     
+ Misses        991      976      -15     
  Partials        6        6              

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