Parser: Support kwarg shorthand for Action View Helper attributes

[marcoroth]

While working on #1432 I noticed that our keyword argument extraction logic for Action View Tag Helpers doesn't 100% produce the right syntax tree for attributes.

Given the following example:

<%= tag.div(id:) %>

Now with this pull request and action_view_helpers: true it parses as:

@ DocumentNode (location: (1:0)-(1:19))
└── children: (1 item)
    └── @ HTMLElementNode (location: (1:0)-(1:19))
        ├── open_tag: 
        │   └── @ ERBOpenTagNode (location: (1:0)-(1:19))
        │       ├── tag_opening: "<%=" (location: (1:0)-(1:3))
        │       ├── content: " tag.div(id:) " (location: (1:3)-(1:17))
        │       ├── tag_closing: "%>" (location: (1:17)-(1:19))
        │       ├── tag_name: "div" (location: (1:8)-(1:11))
        │       └── children: (1 item)
        │           └── @ HTMLAttributeNode (location: (1:12)-(1:12))
        │               ├── name: 
        │               │   └── @ HTMLAttributeNameNode (location: (1:12)-(1:12))
        │               │       └── children: (1 item)
        │               │           └── @ LiteralNode (location: (1:12)-(1:12))
        │               │               └── content: "id"
        │               │       
        │               ├── equals: ":" (location: (1:12)-(1:12))
        │               └── value: 
        │                   └── @ HTMLAttributeValueNode (location: (1:12)-(1:12))
        │                       ├── open_quote: ∅
        │                       ├── children: (1 item)
        │                       │   └── @ RubyLiteralNode (location: (1:12)-(1:12))
-       │                       │       └── content: "id:"
+       │                       │       └── content: "id"
        │                       │       
        │                       ├── close_quote: ∅
        │                       └── quoted: false
        │                       
        ├── tag_name: "div" (location: (1:8)-(1:11))
        ├── body: []
        ├── close_tag: 
        │   └── @ HTMLVirtualCloseTagNode (location: (1:19)-(1:19))
        │       └── tag_name: "div" (location: (1:8)-(1:11))
        │       
        ├── is_void: false
        └── element_source: "ActionView::Helpers::TagHelper#tag"

[pkg-pr-new]

npx https://pkg.pr.new/@herb-tools/formatter@1433

npx https://pkg.pr.new/@herb-tools/language-server@1433

npx https://pkg.pr.new/@herb-tools/linter@1433

commit: 4c5c2e9

[github-actions]

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