(apigateway): metricsEnabled can be inconsistent across deployments

### Describe the bug

API-Gateway's RestApi defines two mechanisms in which to specify `metricsEnabled`:

1. Via StageOptions: https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_apigateway.StageOptions.html
2. Via MethodDeploymentOptions: https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_apigateway.MethodDeploymentOptions.html

If we define a RestApi object with cloudwatch metrics enabled:

```ts
const api = new RestApi(this, 'Api', {
restApiName: 'MyApi',
deployOptions: {
metricsEnabled: true,
methodOptions: {
'/*/*': {
throttlingRateLimit: 200,
throttlingBurstLimit: 600,
},
},
},
});
```

The generated CFN template contains the following snippet:

```json
"MethodSettings": [
{
"DataTraceEnabled": false,
"HttpMethod": "*",
"MetricsEnabled": true,
"ResourcePath": "/*"
},
{
"DataTraceEnabled": false,
"HttpMethod": "*",
"ResourcePath": "/*",
"ThrottlingBurstLimit": 600,
"ThrottlingRateLimit": 200
}
],
```

The code above is logically equivalent to:

```ts
const api = new RestApi(this, 'Api', {
restApiName: 'MyApi',
deployOptions: {
metricsEnabled: true,
throttlingRateLimit: 200,
throttlingBurstLimit: 600,
},
});
```

However, the CFN template produced is:

```json
"MethodSettings": [
{
"DataTraceEnabled": false,
"HttpMethod": "*",
"MetricsEnabled": true,
"ResourcePath": "/*",
"ThrottlingBurstLimit": 600,
"ThrottlingRateLimit": 200
}
],
```

### Expected Behavior

Both code snippets should produce the same cloudformation template, as they are logically equivalent. Meaning - `metricsEnabled` is always true in this particular case.

### Current Behavior

When deploying the first example, `metricsEnabled` can be true or false, and this can change (seemingly randomly) on each new deployment.

### Reproduction Steps

See bug description for details.

### Possible Solution

When compiling the CFN template, it would be awesome if we could either:

1. Fail synthesis because we are providing two conflicting MethodSettings.
2. Recognize these are the same, and make a call on behalf of the user to combine these together
3. If `metricsEnabled`is set at the top level, we should make `metricsEnabled`in `methodOptions`a required property, requiring the user to specify whether or not cloudwatch metrics should be enabled.

### Additional Information/Context

_No response_

### CDK CLI Version

2.64.0 (build fb67c77)

### Framework Version

_No response_

### Node.js Version

14.19.2

### OS

macOS

### Language

Typescript

### Language Version

4.9.5

### Other information

_No response_

Start at the aws_apigateway RestApi deployOptions handling and compare StageOptions with MethodDeploymentOptions during CloudFormation synthesis. Reproduce both snippets and inspect the generated MethodSettings; done means logically equivalent settings no longer produce inconsistent MetricsEnabled behavior.

Written by the indexing model from the issue text.