Extend API for directives and attributes

[Sidnioulz]

This branch extends API support for creating and search directives and attributes. As part of that work, ForNode/ForDirective was heavily normalised through compiler transforms, leading to an AST now distinct from that produced by Vue 3's SFC compiler.

Work to do:

• createAttribute (already done before)
• createDirective
• Typed utilities for individual directives
• ForNode normalisation
• Attribute creation unit tests
• Directive creation unit tests
• ForDirective unit tests
• ForNode unit tests (:construction:)
• Other relevant API unit tests (:construction:)
• Documentation for ForDirective and ForNode changes

[codecov]

Codecov Report

Attention: Patch coverage is 82.78041% with 109 lines in your changes missing coverage. Please review.

Project coverage is 81.23%. Comparing base (6eec7c8) to head (7462d81).
Report is 16 commits behind head on main.

Files with missing lines	Patch %	Lines
src/template/api.ts	82.64%	62 Missing and 1 partial ⚠️
src/shims/compiler-core.d.ts	0.00%	24 Missing ⚠️
src/template/stringify.ts	87.71%	14 Missing ⚠️
src/template/utils.ts	90.62%	3 Missing ⚠️
src/transformTemplate.ts	70.00%	3 Missing ⚠️
src/template/compile.ts	97.77%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #49      +/-   ##
==========================================
+ Coverage   78.47%   81.23%   +2.76%     
==========================================
  Files          20       22       +2     
  Lines        1468     1993     +525     
  Branches      162      215      +53     
==========================================
+ Hits         1152     1619     +467     
- Misses        313      369      +56     
- Partials        3        5       +2     

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