upload inscription content to a CDN

[rafaelcr]

The API could have a configurable option to allow inscription content uploads to a CDN/bucket during indexing. This would mean:

• When a new inscription genesis is detected, upload its contents to the CDN (also write to local DB as it works today)
• If there is a re-org that roll backs that inscription, also remove it from the CDN
• Place a redirect from /ordinals/inscriptions/:id/content to the CDN asset URI

This would help us delegate rate limits to the CDN and reduce psotgres DB load.

[chresko]

This feels like a higher priority, as it gives a level of flexibility I'm not aware of in other APIs.