🎉 Native GitHub connector (#4174)

* GitHub source initial version

All streams are in `full_refresh` mode only.

* Run format command

* Add handling for 404 error in Teams stream

* Update creds naming for github

* Update acceptance tests

* Update check_connection()

* Code review fixes

Remove `/integration_tests/catalog.json` file.
Use `Collaborators` class in `check_connection()` function.
Remove excessive data from GithubStream class.

* Remove unused import

* Implement requested changes

* Add incremental streams

* Remove `supports_incremental`

* Update docs

* Implement requested changes

* Implement requested changes

* Implement requested changes

* Bump connector version

airbyte-integrations/connectors/source-github/source_github/schemas/projects.json

@@ -0,0 +1,50 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "type": "object",
+  "properties": {
+    "_ab_github_repository": {
+      "type": ["string"]
+    },
+    "owner_url": {
+      "type": ["null", "string"]
+    },
+    "url": {
+      "type": ["null", "string"]
+    },
+    "html_url": {
+      "type": ["null", "string"]
+    },
+    "columns_url": {
+      "type": ["null", "string"]
+    },
+    "id": {
+      "type": ["null", "integer"]
+    },
+    "node_id": {
+      "type": ["null", "string"]
+    },
+    "name": {
+      "type": ["null", "string"]
+    },
+    "body": {
+      "type": ["null", "string"]
+    },
+    "number": {
+      "type": ["null", "integer"]
+    },
+    "state": {
+      "type": ["null", "string"]
+    },
+    "creator_id": {
+      "type": ["null", "integer"]
+    },
+    "created_at": {
+      "type": ["null", "string"],
+      "format": "date-time"
+    },
+    "updated_at": {
+      "type": ["null", "string"],
+      "format": "date-time"
+    }
+  }
+}