Implement missing non-retrying assertions

[oleiade]

As we move forward, we aim to get as close as possible to parity with Playwright retrying assertions and their behavior.

The following task list contains the non-retrying assertion matchers that are still to be implemented in the library:

• expect(value).toContain(): String contains a substring
• expect(value).toContain(): Array or set contains an element
• expect(value).toContainEqual(): Array or set contains a similar element
• expect(value).toHaveProperty(): Object has a property
• expect(value).toMatch(): String matches a regular expression
• expect(value).toMatchObject(): Object contains specified properties
• expect(value).toStrictEqual(): Value is similar, including property types
• expect(value).toThrow(): Function throws an error
• expect(value).any(): Matches any instance of a class/primitive
• expect(value).anything(): Matches anything
• expect(value).arrayContaining(): Array contains specific elements
• expect(value).closeTo(): Number is approximately equal
• expect(value).objectContaining(): Object contains specific properties
• expect(value).stringContaining(): String contains a substring
• expect(value).stringMatching(): String matches a regular expression

When a specific matcher is not implementable, because k6 or the k6 browser module doesn't have the necessary requirements, make sure to create a dedicated issue, and link it in the task list.