feat: improve display of payloads comparisons checks

See merge request !67

- ensure expected is on the left, and actual is on the right
- display the difference (if any) as part of the check (not in a separate keyword, less readable)
- pretty print the difference when one is found

Feature/implement test cases for create subscription

See merge request !66

feat: add tags to test cases

See merge request !65

fixed 043_05 missing id variable

See merge request !64

Fix/review tags naming

See merge request !63

Fix/review tests

See merge request !62

fix: update subscription update fragments

See merge request !61