feat: Create initial FlexCluster resource (#1418)

Author: lantoli

cfn-resources/flex-cluster/.rpdk-config

@@ -0,0 +1,12 @@
+{
+    "typeName": "MongoDB::Atlas::FlexCluster",
+    "language": "go",
+    "runtime": "provided.al2",
+    "entrypoint": "bootstrap",
+    "testEntrypoint": "bootstrap",
+    "settings": {
+        "import_path": "github.com/mongodb/mongodbatlas-cloudformation-resources/flex-cluster",
+        "protocolVersion": "2.0.0",
+        "pluginVersion": "2.0.4"
+    }
+}

cfn-resources/flex-cluster/Makefile

@@ -0,0 +1,22 @@
+.PHONY: build test clean
+tags=logging callback metrics scheduler
+cgo=0
+goos=linux
+goarch=amd64
+CFNREP_GIT_SHA?=$(shell git rev-parse HEAD)
+ldXflags=-s -w -X github.com/mongodb/mongodbatlas-cloudformation-resources/util.defaultLogLevel=info -X github.com/mongodb/mongodbatlas-cloudformation-resources/version.Version=${CFNREP_GIT_SHA}
+ldXflagsD=-X github.com/mongodb/mongodbatlas-cloudformation-resources/util.defaultLogLevel=debug -X github.com/mongodb/mongodbatlas-cloudformation-resources/version.Version=${CFNREP_GIT_SHA}
+
+build:
+	cfn generate
+	env GOOS=$(goos) CGO_ENABLED=$(cgo) GOARCH=$(goarch) go build -ldflags="$(ldXflags)" -tags="$(tags)" -o bin/bootstrap cmd/main.go
+
+debug:
+	cfn generate
+	env GOOS=$(goos) CGO_ENABLED=$(cgo) GOARCH=$(goarch) go build -ldflags="$(ldXflagsD)" -tags="$(tags)" -o bin/debug cmd/main.go
+
+clean:
+	rm -rf bin
+
+submit: clean build # submit to private registry must use release build not debug build
+	 cfn submit --set-default --region us-east-1

cfn-resources/flex-cluster/README.md

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+# MongoDB::Atlas::FlexCluster
+
+## Description
+
+Resource for managing [Flex Clusters](https://www.mongodb.com/docs/api/doc/atlas-admin-api-v2/group/endpoint-flex-clusters).
+
+## Requirements
+
+Set up an AWS profile to securely give CloudFormation access to your Atlas credentials.
+For instructions on setting up a profile, [see here](/README.md#mongodb-atlas-api-keys-credential-management).
+
+## Attributes and Parameters
+
+See the [resource docs](docs/README.md).
+
+## Cloudformation Examples
+
+See the examples [CFN Template](/examples/flex-cluster/flex-cluster.json) for example resource.