Improve RandomUUID example generator

[surpher]

🗣 Context

RandomUUID ExampleGenerator is only writing a simple UUID, eg: 22fa4d123c17471bbb6ab57aaa5fb24f into a Pact file. This makes it a bit annoying when expecting uppercased and/or dash separated value.

As an example:

// Let's say Swagger says the value will be a UUID in dashed and uppercased format
// Pact test
// -- code...
body: [
  "id": ExampleGenerator.RandomUUID() // eg: "BDA52033-F0F1-4EC3-8CA4-E04D71572913"
]
// -- code...

PactSwift generates a Pact interaction with the id value of eg: BDA52033-F0F1-4EC3-8CA4-E04D71572913 and passes it to libpact_mock_server_ffi. When FFI is told to generate and write the interactions in a Pact file, a different UUID is generated and written in simple format type, eg: fda98152f0f14ce38aa4b04a54132913.

Because of the above an encodable Swift model that defines a property of type Foundation.UUID fails automatic serialisation unless a custom encodable initialiser is provided. But that could/should be avoided.

💬 Narrative

When I use ExampleGenerator.RandomUUID()
I want to set a specific format
So that the client validation is easier

📝 Notes

Even if defining an ExampleGenerator and preparing a Pact file with a specific format for UUID, libpact_mock_server_ffi returns a different UUID in simple format. Will need to work with pact-foundation/pact-reference to support this.

As a workaround until this is implemented, a Matcher.RegexLike(_:term:) can be used instead and providing the UUID value in the expected format.

🎨 Design

N/A

✅ Acceptance Criteria

GIVEN I use ExampleGenerator.RandomUUID() in a pact test
WHEN I run a pact test
THEN MockService responds with something like BDA52033-F0F1-4EC3-8CA4-E04D71572913

GIVEN I use ExampleGenerator.RandomUUID(.uppercaseDashed) in a pact test
WHEN I run a pact test
THEN MockService responds with something like BDA52033-F0F1-4EC3-8CA4-E04D71572913

GIVEN I use ExampleGenerator.RandomUUID(.dashed) in a pact test
WHEN I run a pact test
THEN MockService responds with something like bda52033-f0f1-4ec3-8ca4-e04d71572913

GIVEN I use ExampleGenerator.RandomUUID(.simple) in a pact test
WHEN I run a pact test
THEN MockService responds with something like bda52033f0f14ec38ca4e04d71572913

🚫 Out of Scope