Recurring Scheduled Resource Creation Support

[yunussandikci]

Hello 👋
This PR contains the following changes while dropping support for package v1alpha1 and adding support to v1alpha2.

• [Feature] Recurring resource creation support by using crontab values.
  You can also still choose exact date(e.g. 2024-12-31T00:00:00Z) or duration (e.g. 10h).

Example: 
apiVersion: cloud.namecheap.com/v1alpha2
kind: ScheduledResource
metadata:
  name: example
spec:
  schedule: "*/5 * * * * * " # Every 5 second  
  ### OR
  schedule:  "TZ=America/Chicago * * * * *" # Every minute in Chicago TZ
  content: |
    apiVersion: v1
    .
    .

• [Improvement] Last Run, Next Run and Schedule information added to Status of ScheduledResource for better visibility.
  

• [Improvement] Linter and Mock Generator is updated.

TODO:

• Update README.md

closes #46

[github-actions]

Go test coverage: 91.4% for commit ff4d0fd

View coverage for all packages

# Package Name                                                | Coverage
+ github.com/NCCloud/mayfly/pkg/common                        |    92.3%
+ github.com/NCCloud/mayfly/pkg/controllers/expiration        |    95.2%
+ github.com/NCCloud/mayfly/pkg/controllers/scheduledresource |    88.4%