add name attribute to Linter class (#753)

* add name attribute to Linter class

fixes #746

* fix test failures

* document()

* restore 100% coverage for utils.R

* deprecate Lint(linter = ...) and remove all calling instances

make expect_lint() resilient to complete removal of the argument

* add NEWS bullet

* document()

* fix lint, collapse with space

fix test expectation

Co-authored-by: Michael Chirico <michaelchirico4@gmail.com>

Author: AshesITR