Make default selectors more like cypress/jQuery

[alexkrolick]

testing-library/dom-testing-library#202 (comment)

[helixbass]

-1 if the suggestion is to make .getBy*() not throw errors on missing elements

Keeping semantic compatibility with react-testing-library would seem like a high priority (for developers using both), and I know I'm writing tests that "implicitly assert" by just calling eg .getByText()

And why wouldn't it be ok to just use .queryBy*() for potentially missing elements (like react-testing-library)?

[alexkrolick]

Cypress already implicitly asserts get and contains.

For background on why compatibility is desirable see #13, #31, #30, #24