Investigate Cloudfront distribution for tiling domain.

[sharkinsspatial]

@leothomas @anayeaye As part of our HLS tiling investigation we've been researching edge caching options for mosaic endpoints. In our case (and I believe yours) we'll continually have data loaded into pgstac so a request that might initially result in a 404 when no assets are available should return a tile on subsequent requests once assets have been loaded. The current release of titiler uses the same Cache-Control header for all responses < 500 which could result in the edge cache maintaining 404 responses for extended periods.

We've made the Cache-Control behavior more configurable developmentseed/titiler#444 to alleviate this. I've put together an initial example of edge caching using this NASA-IMPACT/eoAPI@571ed53 NASA-IMPACT/eoAPI@ed01a74.

[j08lue]

Continued in #83