Google Custom Search API Connector

[lunarserge]

• fsy.py: fs.py is now a pure module and fsy.py is launcher script for it - don't mix together since that is error-prone
• src/facere_sensum/connectors/customsearch.py: implementatoin for Google search data connector (new)
• src/facere_sensum/fs.py: minor fixes to support other changes
• test/t_connectors/t_customsearch.py: unit test for Google search data connector
• test/t_connectors/t_user.py: moved this logic to test/test.py to keep t_connectors folder only for actual tests
• test/test.py: added invocation for connector unit tests, plus additional fixes to support other changes
• test/input/customsearch.json: mock response from Google search API for testing purposes
• examples/config_customsearch.json: example for users & also a test case
• requirements.txt: added Google API lib dependency
• lints.yaml: added fsy.py to testing

[dbabokin]

LGTM