(@aws-cdk/aws-ec2): Proposed, Separate the "vpc" construct to each resource such as subnets, routes, nat-gateway.

[wsscc2021]

Proposed

Separate the "vpc" construct to each resource such as subnets, routes, nat-gateway.

Reason

The "vpc" construct is abstract to 3-tier architecture include aws resources such as vpc and subnet and nat-gateway and etc.
so if it use, can easily write code to provisioning 3-tier architecture and useful to mostly architecture.
However, I sometimes need to special architecture due to business constraint. in this case, it is difficult to modify detailed settings such as subnets and NATs.
so I hope separate the "vpc" construct to each resource such as subnets, routes, nat-gateway and get a tenderness by de-couple each resource dependency.

Proposed Solution

for example,

construct name	description
vpc	Create only "vpc"
eip	Create only eip
nat-gateway	Create only nat-gateway
subnets	Create only subnets (there is already.)
...	...

vpc = aws_ec2.vpc(self, "vpc"
    cidr_block="10.0.0.0/16",
    enable_dns_hostnames=True,
    enable_dns_support=True,
)

subnet['public'][0] = aws_ec2.Subnets(
    self, "public0",
    cidr_block="10.0.0.0/24",
    vpc_id=vpc.id,
    availability_zone="us-east-1a",
    map_public_ip_on_launch=True
)
subnet['public'][1] = aws_ec2.Subnets(
    self, "public1",
    cidr_block="10.0.1.0/24",
    vpc_id=self.vpc.id,
    availability_zone="us-east-1b",
    map_public_ip_on_launch=True
)
subnet['private'][0] = aws_ec2.Subnets(
    self, "private0",
    cidr_block="10.0.2.0/24",
    vpc_id=self.vpc.id,
    availability_zone="us-east-1a",
    map_public_ip_on_launch=True
)
subnet['private'][1] = aws_ec2.Subnets(
    self, "private1",
    cidr_block="10.0.3.0/24",
    vpc_id=self.vpc.id,
    availability_zone="us-east-1b"
)
...

[rix0rrr]

Feels like a duplicate of #5927.

[github-actions]

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