feat(taps): Add files and stats to PullRequestCommitsStream (#241)

The purpose of this PR is to add the `files` and `stats` propertied to
the `PullRequestCommitsStream`.

These properties contain information about the changes done on a given
commit (`additions`, `deletions` and `total`). `files` has these
detailed at the file level whereas `stats` has a summary of changes at
the commit level.

---------

Co-authored-by: Dinis Louseiro <dimplouseiro@gmail>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

tap_github/repository_streams.py

@@ -11,6 +11,7 @@
 
 from tap_github.client import GitHubGraphqlStream, GitHubRestStream
 from tap_github.schema_objects import (
+    files_object,
     label_object,
     milestone_object,
     reactions_object,
@@ -1398,6 +1399,15 @@ class PullRequestCommits(GitHubRestStream):
                 )
             ),
         ),
+        th.Property("files", th.ArrayType(files_object)),
+        th.Property(
+            "stats",
+            th.ObjectType(
+                th.Property("additions", th.IntegerType),
+                th.Property("deletions", th.IntegerType),
+                th.Property("total", th.IntegerType),
+            ),
+        ),
     ).to_dict()
 
     def post_process(self, row: dict, context: Optional[Dict[str, str]] = None) -> dict:

tap_github/schema_objects.py

@@ -59,3 +59,17 @@
     th.Property("rocket", th.IntegerType),
     th.Property("eyes", th.IntegerType),
 )
+
+files_object = th.ObjectType(
+    th.Property("sha", th.StringType),
+    th.Property("filename", th.StringType),
+    th.Property("status", th.StringType),
+    th.Property("additions", th.IntegerType),
+    th.Property("deletions", th.IntegerType),
+    th.Property("changes", th.IntegerType),
+    th.Property("blob_url", th.StringType),
+    th.Property("raw_url", th.StringType),
+    th.Property("contents_url", th.StringType),
+    th.Property("patch", th.StringType),
+    th.Property("previous_filename", th.StringType),
+)