T-1915 [sources] Add Google Cloud Pub/Sub platform (#34)

Author: PetrHeinz

docs/data-sources/source.md

@@ -51,6 +51,7 @@ This Data Source allows you to look up existing Sources using their table name.
     - `fluentd`
     - `fly_io`
     - `go`
+    - `google_cloud_pubsub`
     - `haproxy`
     - `heroku`
     - `http`

docs/resources/source.md

@@ -39,6 +39,7 @@ This resource allows you to create, modify, and delete your Sources. For more in
     - `fluentd`
     - `fly_io`
     - `go`
+    - `google_cloud_pubsub`
     - `haproxy`
     - `heroku`
     - `http`

internal/provider/resource_source.go

@@ -13,7 +13,7 @@ import (
 	"github.com/hashicorp/terraform-plugin-sdk/v2/helper/validation"
 )
 
-var platformTypes = []string{"apache2", "aws_cloudwatch", "aws_ecs", "aws_elb", "aws_fargate", "cloudflare_logpush", "cloudflare_worker", "datadog_agent", "digitalocean", "docker", "dokku", "dotnet", "elasticsearch", "erlang", "filebeat", "fluentbit", "fluentd", "fly_io", "go", "haproxy", "heroku", "http", "java", "javascript", "kubernetes", "logstash", "minio", "mongodb", "mysql", "nginx", "open_telemetry", "php", "postgresql", "prometheus", "prometheus_scrape", "python", "rabbitmq", "redis", "render", "rsyslog", "ruby", "syslog-ng", "traefik", "ubuntu", "vector", "vercel_integration"}
+var platformTypes = []string{"apache2", "aws_cloudwatch", "aws_ecs", "aws_elb", "aws_fargate", "cloudflare_logpush", "cloudflare_worker", "datadog_agent", "digitalocean", "docker", "dokku", "dotnet", "elasticsearch", "erlang", "filebeat", "fluentbit", "fluentd", "fly_io", "go", "google_cloud_pubsub", "haproxy", "heroku", "http", "java", "javascript", "kubernetes", "logstash", "minio", "mongodb", "mysql", "nginx", "open_telemetry", "php", "postgresql", "prometheus", "prometheus_scrape", "python", "rabbitmq", "redis", "render", "rsyslog", "ruby", "syslog-ng", "traefik", "ubuntu", "vector", "vercel_integration"}
 
 var sourceSchema = map[string]*schema.Schema{
 	"team_name": {
@@ -70,6 +70,7 @@ var sourceSchema = map[string]*schema.Schema{
     - **fluentd**
     - **fly_io**
     - **go**
+    - **google_cloud_pubsub**
     - **haproxy**
     - **heroku**
     - **http**