Add test cases for style-props

Author: ota-meshi

Diff for: tests/fixtures/parser/ast/docs/template-syntax/12-component-directives/02-style-props/01-input.svelte

@@ -0,0 +1,6 @@
+<Slider
+  bind:value
+  min={0}
+  --rail-color="black"
+  --track-color="rgb(0, 0, 255)"
+/>

Diff for: tests/fixtures/parser/ast/docs/template-syntax/12-component-directives/02-style-props/01-no-undef-result.json

@@ -0,0 +1,14 @@
+[
+  {
+    "ruleId": "no-undef",
+    "code": "Slider",
+    "line": 1,
+    "column": 2
+  },
+  {
+    "ruleId": "no-undef",
+    "code": "value",
+    "line": 2,
+    "column": 8
+  }
+]