Avoid import dhcp, ssdp, zeroconf in config_flow.py when only used for type checking

[stefdude]

Proposed change

Some users might not use the default_config and avoid loading dhcp, ssdp or zeroconf. Currently, due to type checking, dhcp, ssdp or zeroconf will still be imported. This patch avoids this import (while keeping the annotation).

This is my first PR, and because I applied the same fix to all integrations, this patch might be bigger and touching a lot of integrations. I'm willing to split it up (but would prefer to avoid creating one PR per integration...)

Methodology used:

• make sure that future.annotations and typing.TYPE_CHECKING are imported
• check no other objects of the imported module are being used
• move the import to a conditional import (if TYPE_CHECKING:)
• only import the {Dhcp,Ssdp,Zeroconf}ServiceInfo item

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

Checklist

• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the development checklist
• I have followed the perfect PR recommendations
• The code has been formatted using Ruff (ruff format homeassistant tests)
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

If the code communicates with devices, web services, or third-party tools:

• The manifest file has all fields filled out correctly.
  Updated and included derived files by running: python3 -m script.hassfest.
• New or updated dependencies have been added to requirements_all.txt.
  Updated by running python3 -m script.gen_requirements_all.
• For the updated dependencies - a link to the changelog, or at minimum a diff between library versions is added to the PR description.

To help with the load of incoming pull requests:

• I have reviewed two other open pull requests in this repository.

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