serenity-js / serenity-js / #634

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feat(core): support for Optional chaining, expectation isPresent, refactored Expectations

expectation `isPresent()` now works across the board with any implementation of `Optional`, as well
as with `PageElement` objects identified using the filter pattern (see #1099). `Expectation` class
has also been refactored and simplified to allow for new expectations to be added more easily.
Redundant expectation `property` has been removed, since `ProxiedAnswer` proxy is much more useful /
powerful.

Closes #1099, closes #1103

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