feat(vpcv2): implementation of add gateway method

[shikha372]

Issue # (if applicable)

Closes #.

Reason for this change

implementing below methods for vpcV2. addEgressOnlyInternetGateway addInternetGateway addNatGateway enableVPNGatewayV2

Additional changes: -> Modify Readme -> Separate ipam related Tests

Allows user to define gateways in their vpc with a simple method and an optional default route setup on provided subnets

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Checklist

• [ ] My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

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

[shikha372]

Only half way through.

I'm a bit worried by the number of breaking changes. I understand it is an alpha module and breaking changes are allowed. However, a number of changes are removing an old construct and introduced V2, i.e. VPNGateway is removed and introduced VPNGatewayV2. It's breaking changes anyway, should we just use the same name?

So one is compatible with Route construct and other lives in the main lib VPNGateway is not implementing IRouteTarget so that can not be set as an target while defining a route. So, the V2 is aligned with features (i.e. Route and RouteTable) in this new module, it is more clear that this is latest. Also, if there is already a construct with same name in main lib, not sure if its best practice to introduce another with same name as it can create issue with graduation.

[shikha372]

@mergifyio update

[mergify[bot]]

update

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