chore: bulk gen (#4746)

Added a new feature to the generator to start generating modules for newly added clients. This can be done by adding the new -generate-module flag. The code generated in this PR has been made with these updated generator changes.

Example command to generate a new module and client:
go run cloud.google.com/go/internal/gapicgen/cmd/genbot -local -gocloud-dir /path/to/google-cloud-go -only-gapics -gapic=cloud.google.com/go/contactcenterinsights/apiv1 -generate-module

This commit will be tagged:

- networksecurity/v0.1.0
- accesscontextmanager/v0.1.0
- contactcenterinsights/v0.1.0

Changes:

feat(internal/gapicgen): add ability to carve a module when generating

feat(networksecurity): start generating clients

feat(monitoring/metricsscope): start generating apiv1

feat(accesscontextmanager): start generating clients

feat(contactcenterinsights): start generating clients

feat(networkconnectivity): start generating apiv1

feat(resourcemanager): start generating apiv3

accesscontextmanager/CHANGES.md

@@ -0,0 +1,5 @@
+# Changes
+
+## v0.1.0
+
+- feat(accesscontextmanager): start generating clients

accesscontextmanager/README.md

@@ -0,0 +1,40 @@
+# Access Context Manager API
+
+[![Go Reference](https://pkg.go.dev/badge/cloud.google.com/go/accesscontextmanager.svg)](https://pkg.go.dev/cloud.google.com/go/accesscontextmanager)
+
+Go Client Library for Access Context Manager API.
+
+## Install
+
+```bash
+go get cloud.google.com/go/accesscontextmanager
+```
+
+## Stability
+
+The stability of this module is indicated by SemVer.
+
+However, a `v1+` module may have breaking changes in two scenarios:
+
+* Packages with `alpha` or `beta` in the import path
+* The GoDoc has an explicit stability disclaimer (for example, for an experimental feature).
+
+## Go Version Support
+
+See the [Go Versions Supported](https://github.com/googleapis/google-cloud-go#go-versions-supported)
+section in the root directory's README.
+
+## Authorization
+
+See the [Authorization](https://github.com/googleapis/google-cloud-go#authorization)
+section in the root directory's README.
+
+## Contributing
+
+Contributions are welcome. Please, see the [CONTRIBUTING](https://github.com/GoogleCloudPlatform/google-cloud-go/blob/master/CONTRIBUTING.md)
+document for details.
+
+Please note that this project is released with a Contributor Code of Conduct.
+By participating in this project you agree to abide by its terms. See
+[Contributor Code of Conduct](https://github.com/GoogleCloudPlatform/google-cloud-go/blob/master/CONTRIBUTING.md#contributor-code-of-conduct)
+for more information.