(aws-events): IApiDestination is missing grantInvokeApiDestination

### Describe the feature

The [IApiDestination](https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_events.IApiDestination.html) provides currently no grant* method. This makes it harder/more cumbersome to invoke an API Destination from a given construct.

The permission needed to invoke an API Destination: `events:InvokeApiDestination`

### Use Case

I was building the solution for https://github.com/aws/aws-cdk/issues/29386 and when I wrote the grantPush functionality in there I was missing the `grantInvokeApiDestination` method of `IApiDestination`

### Proposed Solution

Add method `grantInvokeApiDestination` to `IApiDestination` and implement it in `ApiDestination`.

Method signature could look like that:
`public grantInvokeApiDestination(grantee: iam.IGrantable): iam.Grant`.

It will allow the action `events:InvokeApiDestination` for the grantee.

### Other Information

_No response_

### Acknowledgements

- [X] I may be able to implement this feature request
- [ ] This feature might incur a breaking change

### CDK version used

2.136.0

### Environment details (OS name and version, etc.)

windows 11

Start at the IApiDestination and ApiDestination entry points in the aws_events module, then inspect the existing grant* patterns they expose. Add the requested grantInvokeApiDestination signature and verify that it grants events:InvokeApiDestination to the supplied grantee; update or run the corresponding module tests if present.

Written by the indexing model from the issue text.