matcha4smiley/faKeTime

AI Summary: Implement a new `FakeDateTime.adjustable(base: Instant)` function in Kotlin that allows setting a base time and shifting it by a duration. This function should initially support only `Instant` and `unixTime` and include unit tests and updated documentation.

AI Summary: Implement a `FakeDateTime.ticked(...)` function in Kotlin that simulates a counter-based clock, advancing time by a specified duration with each call to `instant()` or `unixTime()`. This initially only needs to support `Instant` and `unixTime()`, requiring the creation of the function, implementation of the time advancement logic, unit tests, sample code, and updated documentation.