Update field properties to add more customization

Author: Viktor Pelepiak

slack-base/src/main/java/com/hubspot/slack/client/methods/params/chat/workobject/entity/EntityPayloadAttributesCustomFieldIF.java

@@ -1,13 +1,39 @@
 package com.hubspot.slack.client.methods.params.chat.workobject.entity;
 
+import com.fasterxml.jackson.databind.PropertyNamingStrategies;
+import com.fasterxml.jackson.databind.annotation.JsonNaming;
+import com.fasterxml.jackson.databind.annotation.JsonSerialize;
 import com.hubspot.immutables.style.HubSpotStyle;
+import com.hubspot.slack.client.methods.params.chat.workobject.serializers.FieldDataTypeSerializer;
+import java.util.Optional;
 import org.immutables.value.Value;
 
 @Value.Immutable
 @HubSpotStyle
+@JsonNaming(PropertyNamingStrategies.SnakeCaseStrategy.class)
 public interface EntityPayloadAttributesCustomFieldIF {
   String getKey();
   String getLabel();
   String getValue();
-  String getType();
+
+  @JsonSerialize(using = FieldDataTypeSerializer.class)
+  FieldDataType getType();
+
+  //Can only be set when the type is string. This icon will be displayed next to field's text value. Not compatible with tag_color.
+  Optional<Icon> getIcon();
+
+  //Can only be set when the type is string, date, or timestamp. The field's content will be hyperlinked with the URL specified here
+  Optional<String> getLink();
+
+  //Can only be set when the type is string. Allows the string to be highlighted in of one of the following colors: red, yellow, green, gray, blue. E.g. tag_color: "red"
+  Optional<String> getTagColor();
+
+  //Used when the field's type is slack#/types/image.
+  Optional<String> getImageUrl();
+
+  //Used when the field's type is slack#/types/image.
+  Optional<String> getSlackFile();
+
+  //Used when the field's type is slack#/types/image.
+  Optional<String> getAltText();
 }