add support for GET/POST/DELETE action association to a service

[imjaroiswebdev]

Add support for Automation Actions' Action association with a Service...

• GET - https://api.pagerduty.com/automation_actions/actions/{id}/services/{team_id}
• POST - https://api.pagerduty.com/automation_actions/services/{id}/teams
• DELETE - https://api.pagerduty.com/automation_actions/actions/{id}/services/{team_id}

New tests cases introduced...

make test TESTARGS="-v -run TestAutomationActionsActionServiceAssociation"
==> Testing go-pagerduty
=== RUN   TestAutomationActionsActionServiceAssociationCreate
2023/01/05 16:36:22 ===== PagerDuty Cache Skipping Init =====
--- PASS: TestAutomationActionsActionServiceAssociationCreate (0.00s)
=== RUN   TestAutomationActionsActionServiceAssociationDelete
2023/01/05 16:36:22 ===== PagerDuty Cache Skipping Init =====
--- PASS: TestAutomationActionsActionServiceAssociationDelete (0.00s)
=== RUN   TestAutomationActionsActionServiceAssociationGet
2023/01/05 16:36:22 ===== PagerDuty Cache Skipping Init =====
--- PASS: TestAutomationActionsActionServiceAssociationGet (0.00s)
PASS
ok      github.com/heimweh/go-pagerduty/pagerduty       0.426s

[mrdubr]

DissociateFromService is more correct from the grammar perspective, IMO.

[mrdubr]

Minor grammar suggestion

[mrdubr]

LGTM! 👍