Add observers for stylesheet mutations (#177)

* hack together stylesheet observer

* Add test coverage for insertRule/deleteRule on stylesheets

* Add new observers

* update patch based on changes to master

* Functioning event recording

* Remove print statements

* Fix ID usage and mark add vs remove

* Correct type

Co-authored-by: Jon Perl <perl.jonathan@gmail.com>

test/__snapshots__/integration.test.ts.snap

@@ -286,7 +286,7 @@ exports[`block 1`] = `
                     \\"attributes\\": {
                       \\"class\\": \\"rr-block\\",
                       \\"rr_width\\": \\"1904px\\",
-                      \\"rr_height\\": \\"21px\\"
+                      \\"rr_height\\": \\"19px\\"
                     },
                     \\"childNodes\\": [],
                     \\"id\\": 18