add(platform): BYOC MS2

[wojcik-dorota]

https://aiven.atlassian.net/browse/MILK-215

Features

• User-owned storage used for:
  • Tiered storage
  • Backups
• Arch diagrams: add 2 S3 buckets in pub/priv subnets
• CLI cloud creation flow for AWS
• Console cloud creation flow for Google

New docs:

• Storing data in custom clouds
• View custom cloud status
• Manage services hosted in custom clouds

Updated docs:

• BYOC concept
• Create custom clouds

Checklist

• The first paragraph of the page is on one line.
• The other lines have a line break at 90 characters.
• I checked the output.
• I applied the style guide.
• My links start with /docs/.

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