feat: Add new test suite for context merging

[chrfwow]

This PR

Adds gherkin tests to verify the merging order of contexts: https://openfeature.dev/specification/sections/evaluation-context/#requirement-323

See open-feature/flagd-testbed#13

[aepfli]

Thank you, i think those gherkin tests will make our live easier in the future. But we have to be a little bit more careful how we enable certain tests with tagging. not all sdks support the whole feature set, and we want them to use this files and limit the usage. We should think about how to properly tag certain tests, or move them in separate scenarios. eg. transaction context merging

[aepfli]

looks good, we might want to have also one test with @Hooks @Transaction testing both together - i know it is another duplication, and to be honest, i do not have a hard feeling for or against them. Thank you for improving our gherkin tests.

[chrfwow]

@aepfli when I annotate a test with both @Hooks and @Transaction, will it be executed when both tags are enabled, or when one of the tags is enabled?

[aepfli]

@aepfli when I annotate a test with both @Hooks and @Transaction, will it be executed when both tags are enabled, or when one of the tags is enabled?

you can say eg. "Transaction and not Hooks" or simply "not hooks" if a feature is disabled, so you can be flexible with the selection of tags