scoped-block-params-autocomplete

[lifeart]

this pr allow us:

• get node source code (for Handlebars)
• check PathExpression for scoped definition (via blocks)
• capture focus on block param definition
• get block param declaration node (from PathExpression)

new public API for focusPath:

type BlockParam = {
        type: 'BlockParam';
        name: string;
        path: ASTPath;
        index: number
};

{
  sourceForNode: () => string | undefined,
  sourceForParent: () => string | undefined,
  metaForType(string: 'handlebars') {
    return {
      maybeBlockParamDefinition: undefined | BlockParam,
      maybeBlockParamDeclarationBlockPath: undefined | ASTPath,
      localScope: BlockParam[]
    }
  }
}

#12

[codecov]

Codecov Report

Merging #29 into component-context-info-origin will increase coverage by 2.86%.
The diff coverage is 71.54%.

@@                        Coverage Diff                        @@
##           component-context-info-origin      #29      +/-   ##
=================================================================
+ Coverage                          35.01%   37.87%   +2.86%     
=================================================================
  Files                                 17       17              
  Lines                               1191     1299     +108     
  Branches                             274      294      +20     
=================================================================
+ Hits                                 417      492      +75     
- Misses                               774      807      +33

Impacted Files	Coverage Δ
...uiltin-addons/core/template-completion-provider.ts	17.55% <15.38%> (+0.05%)	⬆️
src/utils/ast-helpers.ts	10.78% <50%> (+0.38%)	⬆️
src/glimmer-utils.ts	81.32% <78.7%> (-7.41%)	⬇️

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