Support project numbers in monitored project

[modular-magician]

fixes hashicorp/terraform-provider-google#15211

• needed a diff suppress for short & long versions with project name and number
• modified the decoder to look for a project number instead of project id when given a project number
• added two acceptance tests for short and long form project number creation
• added unit tests for diff suppress function

Completed the following manual upgrade tests:

• created w/ long id in 4.70 -> upgraded to built provider successfully

• created w/ short id in 4.70 -> upgraded to built provider successfully

• created w/ long num in 4.70 -> upgraded to built provider successfully

• created w/ short num in 4.70 -> upgraded to built provider successfully

• created w/ long id in 4.75 -> upgraded to built provider successfully

• created w/ short id in 4.75 -> upgraded to built provider successfully

• created w/ long num in 4.75 & failed as expected, could not upgrade without importing

• created w/ short num in 4.75 & failed as expected, could not upgrade without importing

Release Note Template for Downstream PRs (will be copied)

monitoring: fixed an issue in `google_monitoring_monitored_project` where project numbers were not accepted for `name`

Derived from GoogleCloudPlatform/magic-modules#8454