Initial commit: Pezkuwi SubQuery indexer

- pezkuwi.yaml: Relay chain staking indexer (rewards, slashes, pools, transfers, era info)
- pezkuwi-assethub.yaml: Asset Hub indexer (NominationPools, asset transfers)
- GraphQL schema for staking data entities
- Handler mappings from Nova SubQuery base

scripts/python_scripts/subquery_cli.py

@@ -0,0 +1,53 @@
+import subprocess
+import wget
+import os
+import zipfile
+import os
+import platform
+
+def get_subquery_cli(subquery_cli_version):
+
+    download_url = "https://github.com/fewensa/subquery-cli/releases/download/v" + subquery_cli_version
+    temporary_path = "./temporary"
+
+    current_platform = platform.system()
+
+    if current_platform == "Linux":
+        download_url += "/subquery-linux-x86_64.zip"
+    elif current_platform == "Darwin":
+        download_url += "/subquery-macos-x86_64.zip"
+    elif current_platform == "Windows":
+        download_url += "/subquery-windows-x86_64.zip"
+    else:
+        raise ValueError('Can\'t to recognize the operating system')
+
+    try:
+        os.makedirs(temporary_path, exist_ok=False)
+        wget.download(download_url, out = temporary_path)
+        for file in os.listdir(temporary_path):
+            with zipfile.ZipFile(temporary_path+'/'+file) as item:
+                item.extractall(temporary_path)
+    except:
+        pass
+
+    subprocess.call(['chmod', '-R', '777', temporary_path])
+
+    return temporary_path
+
+
+def use_subquery_cli(subquery_cli_version, *args):
+    temporary_path = get_subquery_cli(subquery_cli_version)
+    data_from_subquery = subprocess.check_output([temporary_path+'/subquery', *args]).decode()
+
+    return data_from_subquery
+
+
+
+if __name__ == "__main__":
+    # token = os.environ['SUBQUERY_TOKEN', '']
+    token=''
+    # project_key = os.environ['PROJECT_KEY', '']
+    project_key = ''
+    subquery_cli_version = '0.2.4'
+
+    use_subquery_cli(subquery_cli_version, '--token', token, 'deployment', 'list', '-o', 'json', '--org', 'nova-wallet', '--key', project_key)