Feat: Schema Validation Overhaul

[korenyoni]

What

• Overhaul schema validation by adding internal/schemautils and package
• Overhaul general utils pattern by removing utils.go adding internal/datautils.go
• Rename and move client package to codefresh.cfclient
• Ensure plan-time CRON validation for codefresh_pipeline matches current API constraints, while maintaining backwards compatibility for the deprecated codefresh_pipeline_cron_trigger resource, which has different API constraints (6 fields instead of 5)

Why

• More DRY
• Better package structure
• CRON Validation fix

Notes

Checklist

• I have read CONTRIBUTING.md.
• I have allowed changes to my fork to be made.
• I have added tests, assuming new tests are warranted.
• I understand that the /test comment will be ignored by the CI trigger unless it is made by a repo admin or collaborator.

[korenyoni]

/test