Create JS tests for contract functions

[forgetso]

Test functions in provider/src/tasks/tasks.ts by porting and upgrading tests from protocol/tests/prosopo.test.ts. Place the tests in provider/tests/tasks/tasks.test.ts

Linked issues need tested from JS perspective.

• Provider can stake tokens #3
• Provider can unlock staked tokens, deactivating service #4
• Provider can update service origin and/or fee #13
• Active Provider can register data set on blockchain #6
• Register Provider contact details, service origin, fee, and optionally stake #1