Add DateAssertion starter implementation

[JoseLion]

We need to add the starter implementation for assertions of Date instances. By "starter" we mean that we should add the most meaningful assertions needed for Date instances. More complex assertions can be left to a second iteration. Please follow the following guideline to keep consistency across the library:

• Name the class DateAssertion and extend it from Assertion
• Use StringAssertion as a guide for creating assertions and adding tests
• We can get ideas of assertions specific to Date by looking into AssertJ, jest, and jest-extended
  • AssertJ has a base class DateAssert with some shared methods
  • There's a more specific class DateTimeAssert, but Java's DateTime is immutable and more extensive than JavaScript's Date object, so we need to check if any of those methods will be applicable.

[github-actions]

🎉 This issue has been resolved in version 1.0.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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