Tpi

- :tada: add `state_mv` method (13 <- 12)
- :hammer_and_wrench: add tests

- :wrench: drop `make_tf` contextmanager
- :wrench: use single `working_dir` per instance instead of nesting by resource name (17 <- 15)
- :wrench: make `default_resource` public
- :hammer_and_wrench: update tests

- :wrench: quicker startup if `terraform` binary already exists (16 <- 14)

- :tada: add metadata support (10)
- :wrench: make `ssh` optional (7)
- :wrench: simplify `ssh` dependencies (11)
- :hammer_and_wrench: misc metadata & tests updates (8)

- fix resource name in HCL template (6)

- drop separate ABC (5 <- 4)