Move all import workflows into separate product types

docs/source/module/workflows/index.rst

...urce/module/workflows/iptrunk/create_imported_iptrunk.rst

docs/source/module/workflows/iptrunk/index.rst

...workflows/office_router/create_imported_office_router.rst

docs/source/module/workflows/office_router/index.rst

...source/module/workflows/router/create_imported_router.rst

docs/source/module/workflows/router/index.rst

docs/source/module/workflows/site/create_imported_site.rst

docs/source/module/workflows/site/index.rst

...ows/super_pop_switch/create_imported_super_pop_switch.rst

docs/source/module/workflows/super_pop_switch/index.rst

docs/source/module/workflows/tasks/import_office_router.rst

docs/source/module/workflows/tasks/import_router.rst

docs/source/module/workflows/tasks/import_site.rst

gso/products/__init__.py

gso/products/product_types/iptrunk.py

gso/products/product_types/office_router.py

gso/products/product_types/router.py

gso/products/product_types/site.py

gso/products/product_types/super_pop_switch.py