Add option for S3 direct downloads with presigned urls

[silenium-dev]

Request details

S3 can be used with presigned urls, which would enable redirecting to the object storage instead of proxying the download, saving bandwidth on the Reposilite server.
This is especially useful when using a different server (Minio on different machine) or external service (S3, GCS) and the bandwidth for object storage is independent from Reposilite.

AWS docs: https://docs.aws.amazon.com/AmazonS3/latest/userguide/using-presigned-url.html
This is usually supported by S3-compatible providers, e.g. GCS, R2 and Minio

Of course, this only works if the object storage is reachable from the maven client.

[solonovamax]

from the discord where this topic came up at one point:

also gradle/maven running on older java version does not follow 3xx statuses at all by default

but, maybe smth that could be done is to parse the user agent to identify the java version (afaik it should include that in the user agent)
if on a modern jdk, return a 302, otherwise fall back to streaming it

tho there's always the possibility of people using build tools that 1. dont send a proper user agent and 2. dont support redirects; so imo there should be a config option to always stream. (bonus, this would allow caching of artifacts locally rather than having to query S3 all the time)

that's why I said fallback to streaming it

if the useragent can't be parsed nicely, assume the worst-case scenario