feat(criteria): Add TestOpportunityBookable(Non)FreeCancellable criterias

[lukehesluke]

Rationale

Implements openactive/test-interface#18 in the Broker Microservice, which enables the implementation of #548 at a later date.

QA

Here is Broker Microservice configured against https://github.com/openactive/OpenActive.Server.NET (with a small random sample set). You can see that Broker has filtered some Opportunities into each of the new criteria:

The results of calling the Sample Oportunities endpoint with test:testOpportunityCriteria set to TestOpportunityBookableNonFreeCancellable:

Same for the TestOpportunityBookableFreeCancellable:

[nickevansuk]

Looks good!