New testrail run with entire testcases suite

[VStoilovskyi]

Is your feature request related to a problem? Please describe.

When testrail run is required to be created by plugin during pytest execution, new test run selects only test cases which are about to run by pytest(and marked pytest.mark.case). It would be better if new testrail run would would be created with entire testsuite included.

Describe the solution you'd like

Add optional command line flag like --tr-entire-suite. If flag is passed and test run is not exist plugin should create new run with entire suite. Also test suite id should be added to ini config.