Inconsistent types in MockAlgorithm's template 'database' key

[hcadavid]

The code generated by the template creates a MockAlgorithClient instance passing a 'database' key value of type PosixPath (the type returned by Path(__file__).parent:

v6-algorithm-template/test/test.py.jinja

Lines 18 to 28 in f9073e8

	current_path = Path(__file__).parent
	## Mock client
	client = MockAlgorithmClient(
	datasets=[
	# Data for first organization
	[{
	"database": current_path / "test_data.csv",
	"db_type": "csv",
	"input_data": {}
	}],

However, the MockAlgorithmClient constructor uses this key value as the database_uri argument of wrapper's load_data, which, by definition, should be a string:

https://github.com/vantage6/vantage6/blob/2a16890bde9abaf61cf134b00d8553ff5b5ce276/vantage6-algorithm-tools/vantage6/algorithm/tools/wrappers.py#L58-L60

This inconsistency makes the mock-client code generated by v6 algorithm create crash when using a SQL data source, as the load_data implementation for SQL uses string functions (endswith, split, etc).

As a workaround for the algorithm I'm working on, I simply use str() on these keys:

"database": str(current_path / "db-10k.db.sqlite"),