[WIP] VPC with full control

[moatazelmasry2]

This PR wants to implement full control of vpc construct (Issue #5927). At the moment it it allows providing: name,az, type and cidr of an array of subnets.

Example:

   new ec2.Vpc(this, 'VPC', {
     customSubnets: [
         {
             name: 'PublicSubnet1',
             subnetType:  ec2.SubnetType.PUBLIC,
             cidr: 10.0.0.0/28,
             availabilityZone: "eu-central-1a"
         },
         {
             name: 'PrivateSubnet1',
             subnetType:  ec2.SubnetType.Private,
             cidr: 10.0.2.0/28,
             availabilityZone: "eu-central-1a"
         }
     ]
   ```

Request for feedback:
1. Is it acceptable that the VpvProps object contains both subnetConfiguration AND CustomSubnet arrays and the user is free to choose maximum one of them? or should I create a new construct/constructor?
2. What else should I add? Ideas:
2.1: routetable details as part of of the CustomSubnet object
2.2: specify exactly in which publicSubnet should a nat gateway be created for which privateSubnet
2.3 Something else?

----

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

[mergify]

Title does not follow the guidelines of Conventional Commits. Please adjust title before merge.

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[rix0rrr]

Sorry for taking so long to get to this.

I think this feature needs a good chunk of design effort on our part, and is unlikely to be accepted as a community contribution.

Thanks for the good effort though!