add matcher attribute to contentmatchers (#3607) (#462)
add matcher attribute to contentmatchers (#3607) (#462)

* add matcher attribute to contentmatcher

* removed the required field as its mandatory

* tab removed and used spaces

Signed-off-by: Modular Magician <86ce7da8ad74b1c583667a2bebd347455fa06219@google.com>
GoogleCloudPlatform/terraform-google-conversion