ROX-23254: Email Sender add API package

[kurlov]

Description

• handlers should contain parsing request and generating response logic.
• middleware contains common wrappers for endpoint handlers
• routes contains path to handler mapping

Checklist (Definition of Done)

• Unit and integration tests added
• Added test description under Test manual
• Documentation added if necessary (i.e. changes to dev setup, test execution, ...)
• CI and all relevant tests are passing
• Add the ticket number to the PR title if available, i.e. ROX-12345: ...
• Discussed security and business related topics privately. Will move any security and business related topics that arise to private communication channel.
• Add secret to app-interface Vault or Secrets Manager if necessary
• RDS changes were e2e tested manually
• Check AWS limits are reasonable for changes provisioning new resources
• (If applicable) Changes to the dp-terraform Helm values have been reflected in the addon on integration environment

Test manual

CLUSTER_ID=test go run emailsender/cmd/app/main.go

[openshift-ci]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[johannes94]

Did you consider reusing? If so why does it not fit?

acs-fleet-manager/pkg/server/logging/request_logging_middleware.go

Line 13 in ad4a434

func RequestLoggingMiddleware(handler http.Handler) http.Handler {

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: johannes94, kurlov

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