Add feature for range syntax for style queries

Author: ddbeck

features/style-query-range-syntax.yml

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+name: Range syntax for style queries
+description: The `@container style()` CSS at-rule and `if(style())` CSS function queries accept a range syntax, such as `>`, `<`, `>=`, `<=`, to query for inexact values.
+spec: https://drafts.csswg.org/css-conditional-5/#typedef-style-range
+group: container-queries
+# expected compat_features:
+#  - css.types.if.style.range_syntax
+#  - css.at-rules.container.style_queries_for_custom_properties.range_syntax
+# This is a bit of an oddity, where someday this feature will split in two,
+# merging its constituent parts into `container-style-queries` and `if`.

features/style-query-range-syntax.yml.dist

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+# Generated from: style-query-range-syntax.yml
+# Do not edit this file by hand. Edit the source file instead!
+
+status:
+  baseline: false
+  support: {}