fix: Use AWS CDK Annotations to log messages

Use AWS CDK Annotations to log messages instead of our custom Logger.

Annotations have coloured output (info = white, warning = yellow, error = red).

They also work with the `--trace`, `--strict` and `--ignore-errors` flags
of the CDK CLI.

Note, we don't need to employ the trick in #434 as Annotations (somehow)
do not get piped to disk if one redirects output to disk.

Before:

```console
➜ npx cdk synth --strict --path-metadata false --version-reporting false
 # GuStack has 'migratedFromCloudFormation' set to false. MySnsTopic is a stateful construct, it's logicalId will be auto-generated and AWS will create a new resource.
Parameters:
  Stage:
    Type: String
    Default: CODE
    AllowedValues:
      - CODE
      - PROD
    Description: Stage name
```

After:

```console
➜ npx cdk synth --strict --path-metadata false --version-reporting false
[Info at /CdkPlayground/MySnsTopic] GuStack has 'migratedFromCloudFormation' set to false. MySnsTopic is a stateful construct, it's logicalId will be auto-generated and AWS will create a new resource.
Parameters:
  Stage:
    Type: String
    Default: CODE
    AllowedValues:
      - CODE
      - PROD
    Description: Stage name
```

See:
  - https://docs.aws.amazon.com/cdk/api/latest/docs/@aws-cdk_core.Annotations.html

src/constructs/core/migrating.test.ts

@@ -2,7 +2,7 @@ import "@aws-cdk/assert/jest";
 import { SynthUtils } from "@aws-cdk/assert";
 import type { BucketProps } from "@aws-cdk/aws-s3";
 import { Bucket } from "@aws-cdk/aws-s3";
-import { Logger } from "../../utils/logger";
+import { Annotations } from "@aws-cdk/core";
 import type { GuStatefulConstruct } from "../../utils/mixin";
 import type { SynthedStack } from "../../utils/test";
 import { simpleGuStackForTesting } from "../../utils/test";
@@ -24,8 +24,8 @@ We're calling it here to test the function in isolation.
  */
 
 describe("GuMigratingResource", () => {
-  const info = jest.spyOn(Logger, "info");
-  const warn = jest.spyOn(Logger, "warn");
+  const info = jest.spyOn(Annotations.prototype, "addInfo");
+  const warn = jest.spyOn(Annotations.prototype, "addWarning");
 
   afterEach(() => {
     warn.mockReset();

src/constructs/core/migrating.ts

@@ -1,5 +1,5 @@
 import type { CfnElement, IConstruct } from "@aws-cdk/core";
-import { Logger } from "../../utils/logger";
+import { Annotations } from "@aws-cdk/core";
 import { isGuStatefulConstruct } from "../../utils/mixin";
 
 export interface GuMigratingStack {
@@ -55,19 +55,19 @@ export const GuMigratingResource = {
       }
 
       if (isStateful) {
-        Logger.warn(
+        Annotations.of(construct).addWarning(
           `GuStack has 'migratedFromCloudFormation' set to true. ${id} is a stateful construct and 'existingLogicalId' has not been set. ${id}'s logicalId will be auto-generated and consequently AWS will create a new resource rather than inheriting an existing one. This is not advised as downstream services, such as DNS, will likely need updating.`
         );
       }
     } else {
       if (existingLogicalId) {
-        Logger.warn(
+        Annotations.of(construct).addWarning(
           `GuStack has 'migratedFromCloudFormation' set to false. ${id} has an 'existingLogicalId' set to ${existingLogicalId}. This will have no effect - the logicalId will be auto-generated. Set 'migratedFromCloudFormation' to true for 'existingLogicalId' to be observed.`
         );
       }
 
       if (isStateful) {
-        Logger.info(
+        Annotations.of(construct).addInfo(
           `GuStack has 'migratedFromCloudFormation' set to false. ${id} is a stateful construct, it's logicalId will be auto-generated and AWS will create a new resource.`
         );
       }

src/utils/mixin/migratable-construct-stateful.test.ts

@@ -1,9 +1,9 @@
 import type { BucketProps } from "@aws-cdk/aws-s3";
 import "../test/jest";
 import { Bucket } from "@aws-cdk/aws-s3";
+import { Annotations } from "@aws-cdk/core";
 import type { GuStack } from "../../constructs/core";
 import type { GuMigratingResource } from "../../constructs/core/migrating";
-import { Logger } from "../logger";
 import { simpleGuStackForTesting } from "../test";
 import { GuStatefulMigratableConstruct } from "./migratable-construct-stateful";
 
@@ -16,7 +16,7 @@ class StatefulTestGuMigratableConstruct extends GuStatefulMigratableConstruct(Bu
 }
 
 describe("The GuStatefulMigratableConstruct mixin", () => {
-  const info = jest.spyOn(Logger, "info");
+  const info = jest.spyOn(Annotations.prototype, "addInfo");
 
   beforeEach(() => {
     info.mockReset();