* Added a utility for linting a spec

yarn lint:spec generates a markdown file with all beta endpoints and their status in 4.0

* Added tag, summary, asHashString methods and tests

* Made nullable, readOnly & writeOnly props non-calculated in Property class

* Added summary method to Parameter and signature to Method classes

* sdkModels tests

* Updated root jest config for debugging in packages/sdk-codegen

* Added id and signature to Method

* A spec linter for beta endpoints

* Added lodash as a dev dependency in sdk-codegen

* Added a specLinter export in index.ts

* A few minor tweaks

* Fixed a documentation typo

* Added quotes to column name for csv compatibility

* Added signature to Parameter as per feedback

* Removed extra comment

* Added a changelog for packages/sdk-codegen

* Tweaks and tests

* Significantly simplified the compareSpecs logic

Co-authored-by: John Kaster