add sql_source_representation_instance

[danawillow]

Fixes hashicorp/terraform-provider-google#3704

Release Note Template for Downstream PRs (will be copied)

`google_sql_source_representation_instance`

[modular-magician]

Hi! I'm the modular magician. Your PR generated some diffs in downstreams - here they are.

Diff report:

Terraform GA: Diff ( 6 files changed, 703 insertions(+), 2 deletions(-))
Terraform Beta: Diff ( 6 files changed, 703 insertions(+), 2 deletions(-))
TF Conversion: Diff ( 1 file changed, 118 insertions(+))
TF OiCS: Diff ( 4 files changed, 108 insertions(+))

[modular-magician]

Hi! I'm the modular magician. Your PR generated some diffs in downstreams - here they are.

Diff report:

Terraform GA: Diff ( 6 files changed, 707 insertions(+), 2 deletions(-))
Terraform Beta: Diff ( 6 files changed, 707 insertions(+), 2 deletions(-))
TF Conversion: Diff ( 1 file changed, 118 insertions(+))
TF OiCS: Diff ( 4 files changed, 108 insertions(+))

[emilymye]

Looks good (at least within the bounds of being Cloud-SQL-y). I assume there isn't an actual instance being created, so it's fine to have default timeouts be only 4 minutes?

[danawillow]

Yeah it creates nearly instantly so 4 minutes is plenty, good catch though!

[modular-magician]

Hi! I'm the modular magician. Your PR generated some diffs in downstreams - here they are.

Diff report:

Terraform GA: Diff ( 6 files changed, 707 insertions(+), 2 deletions(-))
Terraform Beta: Diff ( 6 files changed, 707 insertions(+), 2 deletions(-))
TF Conversion: Diff ( 1 file changed, 118 insertions(+))
TF OiCS: Diff ( 4 files changed, 108 insertions(+))