Get string representation of javadsl Content and Media Type

Author: mdedetrich

http-core/src/main/scala/org/apache/pekko/http/javadsl/model/ContentType.scala

@@ -61,4 +61,10 @@ trait ContentType {
    * Returns the charset if this ContentType is non-binary.
    */
   def getCharsetOption: Optional[HttpCharset]
+
+  /**
+   * Returns the string representation of this ContentType
+   * @since 1.2.0
+   */
+  def value: String
 }

http-core/src/main/scala/org/apache/pekko/http/javadsl/model/MediaType.scala

@@ -110,4 +110,10 @@ trait MediaType {
    * Creates a media-range from this media-type with a given qValue.
    */
   def toRange(qValue: Float): MediaRange
+
+  /**
+   * Returns the string representation of this MediaType
+   * @since 1.2.0
+   */
+  def value: String
 }