Add checkbox to Issue Template for RPC batch request allowance (#776)

Hello

In #774, I encountered an issue where the bot script wasn't functioning
as expected.

While debugging the script and checking our environment, I found that
the problem was caused by Batch Requests being disabled by default on
the Polygon zkEVM RPC.
It would be helpful to add a note in the template indicating that Batch
Requests are required.

.github/ISSUE_TEMPLATE/new_chain.yml

@@ -20,6 +20,13 @@ body:
       description: RPC URL
     validations:
       required: true
+  - type: checkboxes
+    id: allow_bacth_request
+    attributes:
+      label: The RPC endpoint must allow batch requests for the bot script.
+      options:
+        - label: I confirm that the RPC allows batch requests
+          required: true
   - type: checkboxes
     id: chainlist_url
     attributes: