Port python deps setup to windows

python-setup/tests/check_requests_123.ps1

@@ -0,0 +1,28 @@
+#! /usr/bin/pwsh
+
+$EXPECTED_VERSION=$args[0]
+
+$FOUND_VERSION="$Env:LGTM_PYTHON_SETUP_VERSION"
+$FOUND_PYTHONPATH="$Env:LGTM_INDEX_IMPORT_PATH"
+
+write-host "FOUND_VERSION=$FOUND_VERSION FOUND_PYTHONPATH=$FOUND_PYTHONPATH "
+
+if ($FOUND_VERSION -ne $EXPECTED_VERSION) {
+    write-host "Script told us to use Python $FOUND_VERSION, but expected $EXPECTED_VERSION"
+    exit 1
+} else {
+    write-host "Script told us to use Python $FOUND_VERSION, which was expected"
+}
+
+$env:PYTHONPATH=$FOUND_PYTHONPATH
+
+$INSTALLED_REQUESTS_VERSION = (py -3 -c "import requests; print(requests.__version__)")
+
+$EXPECTED_REQUESTS="1.2.3"
+
+if ($INSTALLED_REQUESTS_VERSION -ne $EXPECTED_REQUESTS) {
+    write-host "Using $FOUND_PYTHONPATH as PYTHONPATH, we found version $INSTALLED_REQUESTS_VERSION of requests, but expected $EXPECTED_REQUESTS"
+    exit 1
+} else {
+    write-host "Using $FOUND_PYTHONPATH as PYTHONPATH, we found version $INSTALLED_REQUESTS_VERSION of requests, which was expected"
+}