kalm (K8s Application lifecycle manager) addon config added

[venkykuberan]

Application Manager addon (KALM) config added to provider.
Fixes hashicorp/terraform-provider-google#5960

Release Note Template for Downstream PRs (will be copied)

* container: added `kalm_config` addon to `google_container_cluster` (beta-only)

[modular-magician]

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

Diff report:

Terraform GA: Diff ( 1 file changed, 3 insertions(+))
Terraform Beta: Diff ( 3 files changed, 43 insertions(+), 2 deletions(-))

[modular-magician]

Oops! It looks like you're using an unknown release-note type in your changelog entries:
*

Please only use the types listed in https://github.com/GoogleCloudPlatform/magic-modules/blob/master/.ci/RELEASE_NOTES_GUIDE.md.

[danawillow]

Looks good! I made some changes to your PR description- take a look at what it looks like now for an idea of how we typically would format the description and the changelog (especially use of the 'fixes' keyword in order to auto-close the linked issue).

I also added a small nit to the test. Once that's changed, this will be good to merge.

[modular-magician]

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

Diff report:

Terraform GA: Diff ( 1 file changed, 3 insertions(+))
Terraform Beta: Diff ( 3 files changed, 43 insertions(+), 2 deletions(-))

[modular-magician]

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

Diff report:

Terraform GA: Diff ( 1 file changed, 3 insertions(+))
Terraform Beta: Diff ( 3 files changed, 42 insertions(+), 1 deletion(-))