* Simplify StateManagerDisk implementation
* Act more like the memory state manager and only track the root state in self.states
* .load_state always loads a single state or returns None
* .populate_states is the new entry point in loading from disk and it only occurs
when the root state is not known
* much fast
* StateManagerDisk now acts much more like StateManagerMemory
Treat StateManagerDisk like StateManagerMemory for AppHarness
* Handle root_state deserialized from disk
In this case, we need to initialize the whole state tree, so any non-persistent
states will still get default values, whereas on-disk states will overwrite the
defaults.
* Cache root_state under client_token for StateManagerMemory compatibility
Mainly this just makes it easier for us to write tests that work against either
Disk or Memory state managers.
* Track backend-only vars that are declared without a default value
Without this provision, declared backend vars can be accidentally shared among
all states if a mutable value is assigned to the class attribute.
* add test case for no default backend var
* lift node version restraint to allow more recent version if already installed
* add node test for latest version
* change python version
* use purple for debug logs
* update workflow
* add playwright dev dependency
* update workflow
* change test
* oops
* improve test
* update test
* fix tests
* mv units tests to a subfolder
* reorganize tests
* fix install
* update test_state
* revert node changes and only keep new tests organization
* move integration tests in tests/integration
* fix integration workflow
* fix dockerfile workflow
* fix dockerfile workflow 2
* fix shared_state