feat: helpers to generate EventBridge event patterns for 26 services (#36121)

### Issue # (if applicable)

Closes #<issue number here>.

### Reason for this change

This PR automatically generates EventBridge Event Pattern based on the information coming from the `awscdk-service-spec`.
This enables this kind of functionality:
```
const bucket = new s3.Bucket(stack, 'Bucket');
const bucketEvents = BucketEvents.fromBucket(bucket);

new events.Rule(stack, 'Rule', {
  eventPattern: bucketEvents.objectCreatedPattern({
    object: { key: ['uploads/*'] }
  }),
  targets: [new targets.LambdaFunction(fn)]
});
```
### Description of changes
This PR introduces a new code generator for `events` to create the following generated code:
```
export class ResourceEvents {
  public static fromResource(workspaceRef: service.IResourceRef): ResourceEvents {
    return new ResourceEvents(workspaceRef);
  }

  private readonly workspaceRef: service.IResourceRef;

  private constructor(workspaceRef: service.IResourceRef) {
    this.workspaceRef = workspaceRef;
  }

  public resourceAccessPattern(options?: ResourceEvents.RessourceAccess.PatternProps): events.EventPattern {
    const { eventMetadata, ...obj } = (options || {});
    return {
      source: ["aws.service"],
      detailType: ["Resource Access"],
      detail: convertWorkSpacesAccessDetailToEventPattern(obj, this.workspaceRef),
      version: eventMetadata?.version,
      resources: eventMetadata?.resources,
      region: eventMetadata?.region
    };
  }
}

export namespace ResourceEvents {
  export class RessourceAccess { }

  export namespace RessourceAccess {
    export interface RessourceAccessDetail {
      readonly myProp?: Array<string>;
      readonly resourceId?: Array<string>;
    }

    export interface PatternProps extends ResourceEvents.ResourceAccess.ResourceAccessDetail {
      readonly eventMetadata?: cdk.AWSEventMetadataProps;
    }
  }
}

// @ts-ignore TS6133
function convertWorkSpacesAccessDetailToEventPattern(obj?: ResourceEvents.WorkSpacesAccess.WorkSpacesAccessDetail, iRef: service.IResourceRef): any {
  const ret = ({
    myProp: obj?.myProp,
    resourceId: (obj?.workspaceId ?? [iRef.resourceRef.resourceId])
  } as any);
  for (const [key, value] of Object.entries(ret)) {
    if ((value === undefined)) delete ret[key];
  }
  if (Object.keys(ret).length === 0) return undefined;;
  return ret;
}
```


### Describe any new or updated permissions being added




### Description of how you validated changes
  - Added unit tests
  - Tested real world functionality by deploying stacks using this new functionality, integ tests will follow


### Checklist
- [X] My code adheres to the [CONTRIBUTING GUIDE](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md) and [DESIGN GUIDELINES](https://github.com/aws/aws-cdk/blob/main/docs/DESIGN_GUIDELINES.md)

----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: leonmk-aws

packages/@aws-cdk/mixins-preview/README.md

@@ -0,0 +1,5 @@
+{
+  "exclude": [
+    "props-default-doc:*"
+  ]
+}

packages/@aws-cdk/mixins-preview/awslint.json

@@ -0,0 +1 @@
+export * from './events.generated';

packages/@aws-cdk/mixins-preview/lib/services/aws-athena/events.ts

@@ -1 +1,2 @@
+export * as events from './events';
 export * as mixins from './mixins';

packages/@aws-cdk/mixins-preview/lib/services/aws-athena/index.ts

@@ -0,0 +1 @@
+export * from './events.generated';

packages/@aws-cdk/mixins-preview/lib/services/aws-autoscaling/events.ts

@@ -1 +1,2 @@
+export * as events from './events';
 export * as mixins from './mixins';

packages/@aws-cdk/mixins-preview/lib/services/aws-autoscaling/index.ts

@@ -0,0 +1 @@
+export * from './events.generated';

packages/@aws-cdk/mixins-preview/lib/services/aws-cloudwatch/events.ts

@@ -1 +1,2 @@
+export * as events from './events';
 export * as mixins from './mixins';

packages/@aws-cdk/mixins-preview/lib/services/aws-cloudwatch/index.ts

@@ -0,0 +1 @@
+export * from './events.generated';

packages/@aws-cdk/mixins-preview/lib/services/aws-codecommit/events.ts

@@ -1 +1,2 @@
+export * as events from './events';
 export * as mixins from './mixins';