feat: Generate `.spec.resources`

[c-pius]

Description

Changes proposed in this pull request:

• parses resources from the module config file and puts it into .spec.resources of the module template
• rawManifest will be defaulted from manifest in the module config file but may be overwritten with an explicit entry in resources

Regarding AC:

• [x] link must be a valid web URL (http* and not file://)

I opted to only allow https. I don't see a case why somebody should provide a http only resource.

Related issue(s)

• closes https://github.com/kyma-project/modulectl/issues/53