[MVP] API Gateway component

[strekm]

Description

First version of api-gateway component responsible for installation / upgrades / deletion of api-gateway controller.

TODO:

• implementation
• pipelines
• tests implementations
• documentation
• rollout

TASKS:

• APIGateway v1alpha1 proposal
• support for installation
• support for default gateway
• global.domainName dropped
• dependency test
• oathkeeper support
• support for uninstallation
• compatibility test
• discovering dependencies (gardener, istio)
• security scan conf
• migration POC
• UI for APIGateway CR
• 2.0 release
• dev env migration
• stage migration
• prod env migration
• documentation

Reasons
part of modularisation

DoD:

• provide documentation
• publish release notes and What's New updates for Kyma customers
• provide unit tests
• test on SKR
• verify Get started guides
• verify resource limits
  - [ ] followup issue
  - [ ] create release and bump in kyma

Attachments
Based on api proposal, technical design and migration proposal (TBD)

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@kyma-bot: Closing this issue.

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