New AsciiDoc rules - catch unclosed attr blocks, catch unclosed id quotes

.vale/fixtures/AsciiDoc/ClosedAttributeBlocks/.vale.ini

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+; Vale configuration file to test the `ClosedAttributeBlocks` rule
+StylesPath = ../../../styles
+MinAlertLevel = error
+[*.adoc]
+AsciiDoc.ClosedAttributeBlocks = YES

.vale/fixtures/AsciiDoc/ClosedAttributeBlocks/testinvalid.adoc

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+//vale-fixture
+:_content-type: ASSEMBLY
+[id="rosa-getting-started
+= Comprehensive guide to getting started with {product-title}
+
+//vale-fixture
+:_content-type: ASSEMBLY
+[id="rosa-getting-started_{context}
+= Another guide to getting started

.vale/fixtures/AsciiDoc/ClosedAttributeBlocks/testvalid.adoc

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+//vale-fixture
+:_content-type: ASSEMBLY
+[id="rosa-getting-started_{context}"]
+= Comprehensive guide to getting started with {product-title}

.vale/fixtures/AsciiDoc/ClosedIdQuotes/.vale.ini

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+; Vale configuration file to test the `ClosedIdQuotes` rule
+StylesPath = ../../../styles
+MinAlertLevel = error
+[*.adoc]
+AsciiDoc.ClosedIdQuotes = YES

.vale/fixtures/AsciiDoc/ClosedIdQuotes/testinvalid.adoc

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+//vale-fixture
+[id="rosa-getting-started_{context}]
+= Comprehensive guide to getting started with {product-title}
+
+//vale-fixture
+[id="rosa-getting-started]
+= Another guide to getting started

.vale/fixtures/AsciiDoc/ClosedIdQuotes/testvalid.adoc

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+//vale-fixture
+:_content-type: ASSEMBLY
+[id="rosa-getting-started_{context}"]
+= Comprehensive guide to getting started with {product-title}

.vale/styles/AsciiDoc/ClosedAttributeBlocks.yml

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+---
+extends: existence
+scope: raw
+level: error
+message: "Attribute block is not closed."
+raw:
+  - '(?<!\/\/)\[.*(?<!\])\n'

.vale/styles/AsciiDoc/ClosedIdQuotes.yml

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+---
+extends: existence
+scope: raw
+level: error
+message: "Quoted ID value is not closed."
+raw:
+  - '(?<!\/\/)\[id\=\".*(?<!\")\]'