Add user login attribute to stagazers schema

[dlachasse]

Description of change

This adds the login attribute of the stargazers response object to the Stargazers schema.

Manual QA steps

• I ran the tap locally to ensure this was working as expected:

$ tap-github --config config.json --properties properties.json
{"type": "STATE", "value": {}}
INFO Starting sync of repository: wandb/local
{"type": "SCHEMA", "stream": "stargazers", "schema": {"selected": true, "type": ["null", "object"], "additionalProperties": false, "properties": {"_sdc_repository": {"type": ["string"]}, "user": {"type": ["null", "object"], "additionalProperties": false, "properties": {"id": {"type": ["null", "integer"]}}}, "starred_at": {"type": ["null", "string"], "format": "date-time"}, "user_id": {"type": ["null", "integer"]}, "login": {"type": ["null", "string"]}}}, "key_properties": ["user_id"]}
INFO METRIC: {"type": "timer", "metric": "http_request_duration", "value": 0.396655797958374, "tags": {"endpoint": "stargazers", "http_status_code": 200, "status": "succeeded"}}
{"type": "RECORD", "stream": "stargazers", "record": {"starred_at": "2020-10-22T17:18:25.000000Z", "user": {"id": 6808929}, "_sdc_repository": "wandb/local", "user_id": 6808929, "login": "szelenka"}, "time_extracted": "2022-06-29T21:57:16.074995Z"}
{"type": "RECORD", "stream": "stargazers", "record": {"starred_at": "2020-10-22T17:22:57.000000Z", "user": {"id": 7882515}, "_sdc_repository": "wandb/local", "user_id": 7882515, "login": "dmeyer3691"}, "time_extracted": "2022-06-29T21:57:16.074995Z"}

Risks

• Since this is only adding an attribute and not changing the granularity of the report this should be low-risk.

Rollback steps

• revert this branch