.pmtiles files can be any unicode char but aws/cloudflare only accept S3 safe characters

[bdon]

In the AWS and Cloudflare proxy implementations we use a regex to parse the URL to a object storage key https://github.com/protomaps/PMTiles/blob/main/serverless/shared/index.ts#L8

This only allows S3-safelisted characters https://docs.aws.amazon.com/AmazonS3/latest/userguide/object-keys.html

But this means that if I have a valid but non safe listed filename我的城市.pmtiles in s3, then I put the lambda proxy in front, it will not work, it will return 404.

We should accept any character in URLs but be careful to avoid path traversal attacks, etc.

This also affects go-pmtiles and thus the GCP and Azure implementations: https://github.com/protomaps/go-pmtiles/blob/main/pmtiles/server.go#L441