* Add initial support for Check Suites
* Add API call detail in CheckSuite.rerequest
* Update Accept header with general instead of preview
* Add 'get check runs' endpoint for CheckSuite with stubs
* Add create check suite endpoint with stub
* Update CheckSuite tests with creat check suite endpoint
* Add update check suites preferences endpoint
* Add repository preferences object and stub file
* Add update check suite preferences tests
Needed for #1621
Co-authored-by: Raju Subramanian <coder@mahesh.net>
