Go rewrite tgc iam converter template and handwritten test files

[zli82016]

Release Note Template for Downstream PRs (will be copied)

[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes:

Diff report

Your PR generated some diffs in downstreams - here they are.

terraform-google-conversion: Diff ( 4 files changed, 450 insertions(+), 14 deletions(-))

[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes:

Diff report

Your PR generated some diffs in downstreams - here they are.

terraform-google-conversion: Diff ( 4 files changed, 450 insertions(+), 14 deletions(-))

[zli82016]

I run the command to generate tgc locally and there are no diffs for the files that have been migrated to Go.

Three folders are generated from magic modules to the TGC provider.

• tfplan2cai/ancestrymanager
• tfplan2cai/converters/google
• tfplan2cai/test

This is the current progress.

• On the left side are all of the files generated into TGC. (I delete these three folders in tgc locally to get the list of files.)
• On the right side are the remaining files that need to be converted.
• The diffs are the files that been converted (I generate the files with the go command line)