Add codeclimate configuration file

Exclude fakes and generated files, and tweak some thresholds:

| Check                       | Failures | Threshold | Action            | New count |
| --------------------------- | -------- | --------- | ----------------- | --------- |
| duplication:identical-code  | 2        | 100       | Force back to 100 | 2         |
| duplication:similar-code    | 70       | 100       | Increase to 400   | 4         |
| structure:argument_count    | 23       | 4         | Increase to 5     | 6         |
| structure:file_lines        | 1        | 250       | Increase to 500   | 1         |
| structure:method_count      | 1        | 20        | Increase to 30    | 1         |
| structure:method_lines      | 8        | 25        | Increase to 50    | 8         |
| structure:return_statements | 56       | 4         | Increase to 8     | 5         |

Co-authored-by: Giuseppe Capizzi <gcapizzi@vmware.com>
Co-authored-by: Kieron Browne <kbrowne@vmware.com>

Author: 2 people

.codeclimate.yml

@@ -0,0 +1,48 @@
+version: "2"         # required to adjust maintainability checks
+
+checks:
+  argument-count:
+    enabled: true
+    config:
+      threshold: 5
+  file-lines:
+    enabled: true
+    config:
+      threshold: 500
+  method-count:
+    enabled: true
+    config:
+      threshold: 20
+  method-lines:
+    enabled: true
+    config:
+      threshold: 50
+  return-statements:
+    enabled: true
+    config:
+      threshold: 8
+  similar-code:
+    enabled: true
+    config:
+      threshold: 400
+  identical-code:
+    enabled: true
+    config:
+      threshold: 100
+
+exclude_patterns:
+- "config/"
+- "db/"
+- "dist/"
+- "features/"
+- "**/node_modules/"
+- "script/"
+- "**/spec/"
+- "**/test/"
+- "**/tests/"
+- "Tests/"
+- "**/vendor/"
+- "**/*_test.go"
+- "**/*.d.ts"
+- "**/fake/*.go"
+- "**/*generated*.go"