Cop idea: like a `RSpec/Capybara/FindElementValueEq` cop

[ydah]

original issue: https://github.com/rubocop/rubocop-rspec/issues/1342#issue-1322935208

# bad
expect(find('input').value).to eq('foobar')
# good
expect(page).to have_field(with: 'foobar')