Change the PactMock DSL

[ludorival]

Enhancement: Introduce More Fluent DSL for PactMock Contract Generation

Currently, developers need to use a combination of every and willRespond/willRespondWith to generate Pact contracts from Mockk mocks. While functional, we can make this more intuitive and fluent by introducing a new DSL.

Current Syntax

every {
    restTemplate.getForEntity(match<String> { it.contains("user-service") }, UserProfile::class.java)
} willRespondWith {
    description("get the user profile")
    providerState("The user has a preferred shopping list")
    ResponseEntity.ok(USER_PROFILE)
}

Proposed Syntax

uponReceiving { 
    restTemplate.getForEntity(any(), any(), any()) 
} withDescription "get a user profile" given state("User should exist") returns ResponseEntity.ok(USER_PROFILE)

Benefits

• More declarative and readable syntax
• Closer to natural language and Pact's terminology
• Reduced boilerplate
• Better alignment with Pact's concepts (upon receiving, given state, etc.)
• Easier to understand for developers familiar with Pact

Implementation Notes

• Introduce new extension functions: uponReceiving
• Maintain all existing functionality (matching rules, provider states, etc.)