Restructure integration tests

[moCello]

Describe what you want implemented
Restructure integration tests and add common setup and verification functions that all tests can use.

Describe "Why" this is needed
Reduce test boilerplate. This way it becomes more transparent what is actually tested and easier to add new tests.

Describe alternatives you've considered
The tests essentially are unit tests (testing one specific functionality/function) but because the testing happens in-circuit and benefit from helper functions, I have kept them as integrations tests.

Additional context
The workload is split over multiple issues. This issue covers:

• add helper functions:
  • setup
  • check_satisfied_circuit
  • check_unsatisfied_circuit
• refactor tests:
  • assert_equal_point
  • assert_equal_public_point
  • component_mul_point
  • component_add_point
  • component_mul_generator
  • component_boolean
  • component_select
  • component_select_one
  • component_select_zero
  • component_select_point
  • component_select_identity