Add Northern Min (mnp) language to Google Cloud Vision engine

Use documentTextDetection instead of textDetection for better
recognition of complex diacritic characters used in mnp.

Bug: T383002

Author: vm-pranavan

public/models.json

@@ -548,6 +548,10 @@
             "languages": ["mn"],
             "title": "Монгол / Mongolian / Cyrl / Supports handwriting"
         },
+        "mnp": {
+            "languages": ["mnp"],
+            "title": "Mìng-dĕ̤ng-ngỳ̄ / Northern Min / Latn / Supports handwriting"
+        },
         "moh": {
             "languages": ["moh"],
             "title": "Kanienʼkéha / Mohawk / Latn / Mapped / Supports handwriting"

src/Engine/GoogleCloudVisionEngine.php

@@ -68,7 +68,7 @@ public function getResult(
 
 		$image = $this->getImage( $imageUrl, $crop );
 		$imageUrlOrData = $image->hasData() ? $image->getData() : $image->getUrl();
-		$response = $this->imageAnnotator->textDetection( $imageUrlOrData, [ 'imageContext' => $imageContext ] );
+		$response = $this->imageAnnotator->documentTextDetection( $imageUrlOrData, [ 'imageContext' => $imageContext ] );
 
 		// Re-try with direct upload if the error returned is something similar to
 		// "The URL does not appear to be accessible by us. Please double check or download the content and pass it in."
@@ -78,7 +78,7 @@ public function getResult(
 			&& stripos( $response->getError()->getMessage(), 'download the content and pass it in' ) !== false
 		) {
 			$image = $this->getImage( $imageUrl, $crop, self::DO_DOWNLOAD_IMAGE );
-			$response = $this->imageAnnotator->textDetection( $image->getData(), [ 'imageContext' => $imageContext ] );
+			$response = $this->imageAnnotator->documentTextDetection( $image->getData(), [ 'imageContext' => $imageContext ] );
 		}
 
 		// Other errors, report to the user.