add get_by_id method and test for schedules (#1011)

* add get_by_id method and test that calls get_by_id and readsinterval from schedule returned
* split tests and style checks actions

Author: jacalata

.github/workflows/run-tests.yml

@@ -25,16 +25,7 @@ jobs:
         python -m pip install --upgrade pip
         pip install -e .[test]
 
-    - name: Format with black
-      run: |
-        black --check --line-length 120 tableauserverclient samples test
-
     - name: Test with pytest
       if: always()
       run: |
         pytest test
-
-    - name: Run Mypy tests
-      if: always()
-      run: |
-        mypy --show-error-codes --disable-error-code misc --disable-error-code import tableauserverclient test