Add hidden contribution_type field to issue templates

Author: SableRaf

.github/ISSUE_TEMPLATE/1_new-library.yaml

@@ -48,3 +48,7 @@ body:
         The result of this validation will be added to this issue:
         - If valid, a pull request will automatically be created to add your library to the repository.
         - If invalid, a comment will be added with details of the error. You will need to fix the file and resubmit.
+  - type: hidden
+    id: contribution_type
+    attributes:
+      value: library

.github/ISSUE_TEMPLATE/2_new-tool.yaml

@@ -48,3 +48,7 @@ body:
         The result of this validation will be added to this issue:
         - If valid, a pull request will automatically be created to add your tool to the repository.
         - If invalid, a comment will be added with details of the error. You will need to fix the file and resubmit.
+  - type: hidden
+    id: contribution_type
+    attributes:
+      value: tool

.github/ISSUE_TEMPLATE/3_new-mode.yaml

@@ -48,3 +48,7 @@ body:
         The result of this validation will be added to this issue:
         - If valid, a pull request will automatically be created to add your mode to the repository.
         - If invalid, a comment will be added with details of the error. You will need to fix the file and resubmit.
+  - type: hidden
+    id: contribution_type
+    attributes:
+      value: mode

.github/ISSUE_TEMPLATE/4_new-examples.yaml

@@ -47,4 +47,8 @@ body:
 
         The result of this validation will be added to this issue:
         - If valid, a pull request will automatically be created to add your example pack to the repository.
-        - If invalid, a comment will be added with details of the error. You will need to fix the file and resubmit.
+        - If invalid, a comment will be added with details of the error. You will need to fix the file and resubmit.
+  - type: hidden
+    id: contribution_type
+    attributes:
+      value: examples