fix: global nested stack

[mr-robot-in]

Fixes #

---

Note

Introduces a global useNestedStacks flag in VPCProps and wires it through Network.createSubnet to optionally create subnets via SubnetStack, overridable per subnet; updates CHANGELOG.

• Network construct (src/constructs/network.ts):
  • Add global useNestedStacks to VPCProps and read it in the Network constructor.
  • Update createSubnet(...) to accept a global flag and decide between nested SubnetStack creation vs inline subnet/NACL/route resources, with per-subnet useNestedStacks overriding the global.
  • Pass the global flag from constructor to createSubnet.
• Docs:
  • Update CHANGELOG.md with entries for configurable route table entry naming and global nested subnet stacks configuration.

^{Written by Cursor Bugbot for commit 845fee8. This will update automatically on new commits. Configure here.}