`input type=file` element

Pass Criteria

#1: Element is supported
#2: Correct HTML and Core Accessibility API mappings
#3: Correct Accessible Name & Description Calculation

Reference

Test ifile-001: `input type="file"` element

Test ifile-002: `input type="file"` element with `label`

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Test ifile-003: `input type="file"` element with `label`, & `required` attribute

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Test ifile-004: `input type="file"` element with `label`, & `readonly` attribute

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Test ifile-005: `input type="file"` element with `label`, & `disabled` attribute

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Test ifile-006: `input type="file"` element with `label`, & `multiple` attribute

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