feat(@clack/core,@clack/prompts): mock API

[orochaa]

Mock API

This PR introduces a set of changes aimed to enable code testing.

Changes Made

• isTestMode: serves as an internal flag to distinguish between test and production modes.
• exposeTestUtils: serves as an internal function used to expose states and methods from the core Prompt component, along with additional utility functions. This exposure allows for fine-grained control over the behavior of the Prompt during testing.
• mockPrompt: is a testing utility that sets the Prompt component to run in test mode. It returns all utilities configured through the exposeTestUtils function. This is a pivotal tool for simulating user interactions and thoroughly testing our code.

Observations

• This PR depends on feat(@clack/core,@clack/prompts): improve types event emitter & global aliases #147 to expose internal types.
• Some lines could not be covered by tests, but none of them impact the end user. Except by multiline and groupMultiselect that doesn't receive validate function by param, probably it should be changed by other PR.

Test Coverage Result

Relates to #35

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Latest commit: 12951c1

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