feat(aws-ec2): construct for EC2 Instance Connect Endpoint

[badmintoncryer]

This PR introduces the Construct for the EC2 Instance Connect Endpoint, allowing users to easily generate an endpoint and connect to an EC2 instance.

Users only need to specify the vpc property and can configure additional properties as needed.

    const instanceConnectEndpoint = new aws_ec2.InstanceConnectEndpoint(
      this,
      'InstanceConnectEndpoint',
      {
        vpc,
        clientToken: 'my-client-token', // optional
        securityGroups: [securityGroup], // optional
        preserveClientIp: true, // optional
      },
    );

    instanceConnectEndpoint.connections.allowTo(instance, cdk.aws_ec2.Port.tcp(22));

This PR includes both unit and integ tests.

[hoegertn]

Thanks for your contribution. Some small comments from my side

[hoegertn]

Please also run a full build to regenerate the API.md file

[go-to-k]

I'll approve this PR. I would like to leave the rest to @hoegertn .

[badmintoncryer]

@go-to-k I've updated README.md after your approving. Could you please approve this again?

[go-to-k]

Thanks for the contribution!