feat: add new fa attributes for metadata

Dalamud/Interface/FontAwesome/FontAwesomeCategoriesAttribute.cs

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+using System;
+
+namespace Dalamud.Interface;
+
+/// <summary>
+/// Set categories associated with a font awesome icon.
+/// </summary>
+public class FontAwesomeCategoriesAttribute : Attribute
+{
+    /// <summary>
+    /// Initializes a new instance of the <see cref="FontAwesomeCategoriesAttribute"/> class.
+    /// </summary>
+    /// <param name="categories">categories for enum member.</param>
+    public FontAwesomeCategoriesAttribute(string[] categories) => this.Categories = categories;
+
+    /// <summary>
+    /// Gets or sets categories.
+    /// </summary>
+    public string[] Categories { get; set; }
+}

Dalamud/Interface/FontAwesome/FontAwesomeSearchTermsAttribute.cs

@@ -0,0 +1,20 @@
+using System;
+
+namespace Dalamud.Interface;
+
+/// <summary>
+/// Set search terms associated with a font awesome icon.
+/// </summary>
+public class FontAwesomeSearchTermsAttribute : Attribute
+{
+    /// <summary>
+    /// Initializes a new instance of the <see cref="FontAwesomeSearchTermsAttribute"/> class.
+    /// </summary>
+    /// <param name="searchTerms">search terms for enum member.</param>
+    public FontAwesomeSearchTermsAttribute(string[] searchTerms) => this.SearchTerms = searchTerms;
+
+    /// <summary>
+    /// Gets or sets search terms.
+    /// </summary>
+    public string[] SearchTerms { get; set; }
+}