Add feature for justify-self in block layouts (#3505)

Author: ddbeck

features/justify-self-block.yml

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+name: justify-self in block layouts
+description: >
+  The `justify-self` CSS property aligns an item along a container's inline axis in block layouts, like it does in grid layouts.
+  Likewise, the `justify-items` property sets a default `justify-self` value for all items in a container in a block layout.
+spec: https://drafts.csswg.org/css-align-3/#justify-block
+group: layout
+compat_features:
+  - css.properties.justify-items.block_context
+  - css.properties.justify-self.block_context

features/justify-self-block.yml.dist

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+# Generated from: justify-self-block.yml
+# Do not edit this file by hand. Edit the source file instead!
+
+status:
+  baseline: false
+  support:
+    chrome: "130"
+    chrome_android: "130"
+    edge: "130"
+compat_features:
+  - css.properties.justify-items.block_context
+  - css.properties.justify-self.block_context