Allow caching directly to Azure or S3 blob storage

[lilith]

Cache size limits are untenable for those compiling large Rust or C++ apps that need gigabytes of caching per run.

Azure Blob Storage and S3 both offer built-in automatic blob eviction via lifecycle management.

I propose extending packages/cache/src/internal/cacheHttpClient or adding a swappable implementation to permit caching directly to Azure or S3 (either works), and enabling this behavior when the requisite environment variables are set.

This would bypass the cache service, which I believe is currently responsible for proxying uploads and handling eviction.

Required environment variables

ACTIONS_CACHE_AZURE_CONTAINER
ACTIONS_CACHE_AZURE_CONNECTION_STRING

[s0undt3ch]

Almost 3 years past, will this ever be considered?